Author 
Message 
TAGS:

Hide Tags

Manager
Joined: 02 Jun 2011
Posts: 147

x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2012, 07:18
10
This post received KUDOS
31
This post was BOOKMARKED
Question Stats:
36% (01:21) correct 64% (01:33) wrong based on 1052 sessions
HideShow timer Statistics
x=2y, what is the value of x2y? (1) x+2y = 6 (2) xy>0 i wish to have clarification on st. 1. x+2y = 6 if x = 2, y = 2 or if x= 2 , y = 4 then also it is '6'
do we need to keep the constraint +x = +2y while evaluating st.1 ?
Official Answer and Stats are available only to registered users. Register/ Login.



Math Expert
Joined: 02 Sep 2009
Posts: 43917

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2012, 07:35
10
This post received KUDOS
Expert's post
10
This post was BOOKMARKED
x=2y, what is the value of x2y?First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\). (1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient. (2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient. Answer: D. Hope it's clear.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Manager
Joined: 02 Jun 2011
Posts: 147

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
28 May 2012, 07:57
Bunuel wrote: x=2y, what is the value of x2y?
First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\).
(1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient.
(2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient.
Answer: D.
Hope it's clear. Dear Bunuel, whenever absolute value is analysed, we take two scenarios of <0 and >0. So, why the same is not considered for x ?



Math Expert
Joined: 02 Sep 2009
Posts: 43917

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
28 May 2012, 08:09
4
This post received KUDOS
Expert's post
3
This post was BOOKMARKED
kashishh wrote: Bunuel wrote: x=2y, what is the value of x2y?
First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\).
(1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient.
(2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient.
Answer: D.
Hope it's clear. Dear Bunuel, whenever absolute value is analysed, we take two scenarios of <0 and >0. So, why the same is not considered for x ? If \(x\leq{0}\) and \(y\leq{0}\) then \(x=2y\) expands as \(x=2y\) > \(x=2y\); If \(x\leq{0}\) and \(y>{0}\) then \(x=2y\) expands as \(x=2y\) > \(x=2y\); If \(x>{0}\) and \(y\leq{0}\) then \(x=2y\) expands as \(x=2y\); If \(x>{0}\) and \(y>{0}\) then \(x=2y\) expands as \(x=2y\). So as you can see \(x=2y\) can expand only in two ways \(x=2y\) or \(x=2y\) (as shown above ++ and  are the same, and + and + are the same).
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Intern
Joined: 28 Sep 2011
Posts: 34
Location: India
WE: Consulting (Computer Software)

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
31 May 2012, 19:45
Tricky question.... I gave 2 much time to evaluate stmt 1 and went with A.
_________________
Kudos if you like the post!!!



Senior Manager
Joined: 13 May 2011
Posts: 289
WE 1: IT 1 Yr
WE 2: Supply Chain 5 Yrs

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
05 Jun 2012, 12:18
2
This post received KUDOS
Bunuel: can we rewrite x=2y as x^24x^2=0 ? I have solved the problem doing so, but not sure if it algebraically correct. Below what i did:
(x2y)(x+2y)=0
Using statement 1: (x2y)*6=0 so, (x2y)=0. Sufficient
Using statement 2: x=2y [same sign] (x2y)=0. Sufficient
D



Math Expert
Joined: 02 Sep 2009
Posts: 43917

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
07 Jun 2012, 13:35



Intern
Joined: 23 Sep 2008
Posts: 23

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
24 Jul 2012, 15:10
Bunuel wrote: BDSunDevil wrote: Bunuel: can we rewrite x=2y as x^24x^2=0 ? I have solved the problem doing so, but not sure if it algebraically correct. Below what i did:
(x2y)(x+2y)=0
Using statement 1: (x2y)*6=0 so, (x2y)=0. Sufficient
Using statement 2: x=2y [same sign] (x2y)=0. Sufficient
D Yes, you can square \(x=2y\) and write \(x^2=4y^2\) > \((x2y)(x+2y)=0\) > either \(x=2y\) or \(x=2y\) the same two options as in my solution above. Hi Bunuel, I had a query regarding an official statement in the solution to this problem. Actually, the book says that , as, x+2y=6 , so a positive sum indicates that both x and 2y must be positive. However, 4+10= 10+(4) = 6 =positive sum [both x and 2y are not positive] 10+4=14= positive sum [both x & 2y are positive] isn't it? Please clarify the confusion here..



VP
Joined: 02 Jul 2012
Posts: 1212
Location: India
Concentration: Strategy
GPA: 3.8
WE: Engineering (Energy and Utilities)

Re: IxI = I2yI what is the value of x  2y? [#permalink]
Show Tags
26 Jan 2013, 11:08
1
This post received KUDOS
alexpavlos wrote: IxI = I2yI what is the value of x  2y?
1) x + 2y = 6 2) xy > 0
I can understand what to do with statement 2. Statement 1, I have no clue what to do with it!
Thanks! Alex x + 2y = 6 Hence we know that x is not equal to 2y, but x = 2y So, x = 2y
_________________
Did you find this post helpful?... Please let me know through the Kudos button.
Thanks To The Almighty  My GMAT Debrief
GMAT Reading Comprehension: 7 Most Common Passage Types



Senior Manager
Joined: 13 May 2013
Posts: 456

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2013, 14:04
Hello, I am a bit confused regarding absolute value. If \(x=2y\), then why why aren't x and 2y both positive? If the abs. value of something (i.e. it's positive value) is equal to something else, doesn't that imply that they are both positive? For example, if x=2y doesn't that mean that x is positive? Also, for #2, xy both have the same signs. If x and y are negative, why would x=2y become x = 2y? I get that it's equal to x=2y but why even take that step? x = 2y will always be positive, right? Bunuel wrote: x=2y, what is the value of x2y?
First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\).
(1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient.
(2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient.
Answer: D.
Hope it's clear.



Math Expert
Joined: 02 Sep 2009
Posts: 43917

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2013, 14:22
WholeLottaLove wrote: Hello, I am a bit confused regarding absolute value. If \(x=2y\), then why why aren't x and 2y both positive? If the abs. value of something (i.e. it's positive value) is equal to something else, doesn't that imply that they are both positive? For example, if x=2y doesn't that mean that x is positive? Also, for #2, xy both have the same signs. If x and y are negative, why would x=2y become x = 2y? I get that it's equal to x=2y but why even take that step? x = 2y will always be positive, right? Bunuel wrote: x=2y, what is the value of x2y?
First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\).
(1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient.
(2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient.
Answer: D.
Hope it's clear. The absolute value cannot be negative \(some \ expression\geq{0}\), or \(x\geq{0}\) (absolute value of x, x, is the distance between point x on a number line and zero, and the distance cannot be negative). So, if given that \(x=2y\) then \(x\) must be more than or equal to zero (RHS is nonnegative thus LHS must also be nonnegative). But in our case we have that \(x=2y\). In this case \(x\) and/or \(y\) could be negative. For, example \(x=2\) and \(y=1\) > \(x=2=2y\). As for (2): When \(x\leq{0}\) then \(x=x\), or more generally when \(some \ expression\leq{0}\) then \(some \ expression={(some \ expression)}\). For example: \(5=5=(5)\); When \(x\geq{0}\) then \(x=x\), or more generally when \(some \ expression\geq{0}\) then \(some \ expression={some \ expression}\). For example: \(5=5\). So, if \(x<0\) and \(y<0\), then \(x=x\) and \(2y=2y\) > \(x=2y\) > \(x=2y\). If \(x>0\) and \(y>0\), then \(x=x\) and \(2y=2y\) > \(x=2y\), the same as in the first case. For more check Absolute Value chapter of Math Book: mathabsolutevaluemodulus86462.htmlDS questions on absolute value to practice: search.php?search_id=tag&tag_id=37PS questions on absolute value to practice: search.php?search_id=tag&tag_id=58Tough absolute value and inequity questions with detailed solutions: inequalityandabsolutevaluequestionsfrommycollection86939.htmlHope it helps.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Senior Manager
Joined: 13 May 2013
Posts: 456

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2013, 15:16
Ok, so I get that Abs. value cannot be negative...distance cannot have a negative value. We are trying to solve for x2y, so naturally we are trying to determine x2y. So, If x=2y then the value of x2y = 2y2y = 0 OR If x=2y (the absolute value of 2y) then the value of x2y = 2y2y = 4y, correct? I guess what throws me off is when you write When x\leq{0} then x=x. What you're saying is that, for example, 4 = (4) or 4 = 4. What is the point of writing 4 = (4) One final thing...In the stem you derived x=2y, x=2y. Okay, but in #2. one of the cases is xy>0 so we could have x and y. If x and y are negative, doesn't that mean that you would substitute x and y in to get x=2(y) = x=2y? I'm sorry for being such a dolt. Sometimes, concepts that I know are very simple are extremely difficult to understand. Bunuel wrote: WholeLottaLove wrote: Hello, I am a bit confused regarding absolute value. If \(x=2y\), then why why aren't x and 2y both positive? If the abs. value of something (i.e. it's positive value) is equal to something else, doesn't that imply that they are both positive? For example, if x=2y doesn't that mean that x is positive? Also, for #2, xy both have the same signs. If x and y are negative, why would x=2y become x = 2y? I get that it's equal to x=2y but why even take that step? x = 2y will always be positive, right? Bunuel wrote: x=2y, what is the value of x2y?
First of all \(x=2y\) means that either \(x=2y\) or \(x=2y\).
(1) x+2y = 6. Now, the second case is not possible since if \(x=2y\) then from this statement we would have that \(2y+2y=6\) > \(0=6\), which obviously is not true. So, we have that \(x=2y\), in this case \(x2y=2y2y=0\). Sufficient.
(2) xy>0 > \(x\) and \(y\) are either both positive or both negative, in any case \(x=2y\) becomes \(x=2y\) (if \(x\) and \(y\) are both negative then \(x=2y\) becomes \(x=2y\) which is the same as \(x=2y\)). Now, if \(x=2y\) then \(x2y=2y2y=0\). Sufficient.
Answer: D.
Hope it's clear. The absolute value cannot be negative \(some \ expression\geq{0}\), or \(x\geq{0}\) (absolute value of x, x, is the distance between point x on a number line and zero, and the distance cannot be negative). So, if given that \(x=2y\) then \(x\) must be more than or equal to zero (RHS is nonnegative thus LHS must also be nonnegative). But in our case we have that \(x=2y\). In this case \(x\) and/or \(y\) could be negative. For, example \(x=2\) and \(y=1\) > \(x=2=2y\). As for (2): When \(x\leq{0}\) then \(x=x\), or more generally when \(some \ expression\leq{0}\) then \(some \ expression\leq{(some \ expression)}\). For example: \(5=5=(5)\); When \(x\geq{0}\) then \(x=x\), or more generally when \(some \ expression\geq{0}\) then \(some \ expression\leq{some \ expression}\). For example: \(5=5\). So, if \(x<0\) and \(y<0\), then \(x=x\) and \(2y=2y\) > \(x=2y\) > \(x=2y\). If \(x>0\) and \(y>0\), then \(x=x\) and \(2y=2y\) > \(x=2y\), the same as in the first case. For more check Absolute Value chapter of Math Book: mathabsolutevaluemodulus86462.htmlDS questions on absolute value to practice: search.php?search_id=tag&tag_id=37PS questions on absolute value to practice: search.php?search_id=tag&tag_id=58Tough absolute value and inequity questions with detailed solutions: inequalityandabsolutevaluequestionsfrommycollection86939.htmlHope it helps.
Last edited by WholeLottaLove on 27 May 2013, 15:28, edited 1 time in total.



Math Expert
Joined: 02 Sep 2009
Posts: 43917

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 May 2013, 15:26
WholeLottaLove wrote: Ok, so I get that Abs. value cannot be negative...distance cannot have a negative value.
We are trying to solve for x2y, so naturally we are trying to determine x2y. So,
If x=2y then the value of x2y = 2y2y = 0 OR If x=2y (the absolute value of 2y) then the value of x2y = 2y2y = 4y, correct?
I guess what throws me off is when you write
When x\leq{0} then x=x. What you're saying is that, for example, 4 = (4) or 4 = 4. What is the point of writing 4 = (4)
I'm sorry for being such a dolt. Sometimes, concepts that I know are very simple are extremely difficult to understand. Yes, that's correct: if x=2y, then x2y=0 and if x=2y, then x2y=4y. As for the red part: it's just an example of the statement that if \(x\leq{0}\) then \(x=x\).
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Director
Joined: 23 Jan 2013
Posts: 601

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
29 May 2013, 02:44
x=2y, what is the value of x2y?
(1) x+2y = 6 (2) xy>0
1) that means that x=3 and 2y=3, so difference is only 0 2) that means that x and y is not 0 and both positive or negative and x=2y, so 2y2y=0
D



Senior Manager
Joined: 13 May 2013
Posts: 456

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
30 Jun 2013, 11:28
2
This post received KUDOS
x=2y, what is the value of x2y?
x=2y OR x=2y
(1) x+2y = 6
2y+2y = 6 4y = 6 y=3/2
x+2(3/2) = 6 x+3 = 6 x=3
OR 2y+2y = 6 0=6 (Invalid...6 cannot equal 0) With only one valid solution for x and y we can solve for x2y. SUFFICIENT
(2) xy>0
xy>0 means that BOTH x and y are positive or BOTH x and y are negative. We can choose numbers to make this easier: x=2, y=1
If x=2y, then 2=2(1) OR Id x=2y, then 2 = 2(1)
If x and y are both positive: x2y ===> 22(1) = 0 If x and y are both negative: x2y ===> 2  2(1) ===> 2+2 = 0
SUFFICIENT



Intern
Joined: 28 Apr 2013
Posts: 5

DS: Inequalities source: Manhattan adv quant [#permalink]
Show Tags
08 Jun 2015, 19:11
If x=2y what is the value of x2y?
1. x+2y=6 2. xy>0
Am stuck with solving the statement 1 with case scenarios. Somebody please explain your entire solutions especially the statement one positive negative scenarios.
Thanks.



Retired Moderator
Joined: 06 Jul 2014
Posts: 1269
Location: Ukraine
Concentration: Entrepreneurship, Technology
GMAT 1: 660 Q48 V33 GMAT 2: 740 Q50 V40

x=2y, what is the value of x2y? [#permalink]
Show Tags
08 Jun 2015, 23:21
1
This post received KUDOS
mpingo wrote: If x=2y what is the value of x2y?
1. x+2y=6 2. xy>0
Am stuck with solving the statement 1 with case scenarios. Somebody please explain your entire solutions especially the statement one positive negative scenarios.
Thanks. Hello mpingoThis topic discussed here: x2ywhatisthevalueofx2y133307.htmlPlease, use search before posting Also, please, read rule of posting #3 about naming of topic rulesforpostingpleasereadthisbeforeposting133935.htmlIf after reading discussions above, you will have questions, than write them here and I will be glad to help.
_________________
Simple way to always control time during the quant part. How to solve main idea questions without full understanding of RC. 660 (Q48, V33)  unpleasant surprise 740 (Q50, V40, IR3)  antidebrief



Intern
Joined: 15 Nov 2015
Posts: 47

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
24 Mar 2016, 03:47
ok, x= 2y, or x= 2y> x2y =0 or x+2y =0 1. x+2y =6 so x2y =0 2. x,y >0> x+2y can't be 0 , so x2y =0 D



NonHuman User
Joined: 09 Sep 2013
Posts: 13746

Re: x=2y, what is the value of x2y? [#permalink]
Show Tags
27 Mar 2017, 11:25
Hello from the GMAT Club BumpBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up  doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books  GMAT Club Tests  Best Prices on GMAT Courses  GMAT Mobile App  Math Resources  Verbal Resources




Re: x=2y, what is the value of x2y?
[#permalink]
27 Mar 2017, 11:25






