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M17-19

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M17-19 [#permalink]

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New post 16 Sep 2014, 01:01
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A
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C
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Question Stats:

82% (00:38) correct 18% (00:40) wrong based on 126 sessions

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Kudos [?]: 124614 [0], given: 12079

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New post 16 Sep 2014, 01:01

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Re: M17-19 [#permalink]

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New post 14 Aug 2016, 10:24
can someone explain me more ?
my logic
x+y=x-y
y = 1/2

from statement 2, x>0 means x can 1/2 , 1 , 2

so answer is E

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New post 15 Aug 2016, 03:42

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Re: M17-19 [#permalink]

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New post 05 May 2017, 02:47
The answer must be option C.

Statement 1) This gives x+y=x-y ,i.e. y=0. Not sufficient
Statement 2) x>0 . This is clearly not sufficient.

Combine the two statements y=0 and x>o .ie, x>y.

Hence the answer is option C.
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Re: M17-19 [#permalink]

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New post 05 May 2017, 12:43
I don't get it? What if I come up with y=0, and I put it in the equation given, I will find that x = 1; thus x>y. That means, I can solve the question without using x>0. Can someone answer me?

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Re: M17-19 [#permalink]

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New post 05 May 2017, 12:51
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linhmiu wrote:
I don't get it? What if I come up with y=0, and I put it in the equation given, I will find that x = 1; thus x>y. That means, I can solve the question without using x>0. Can someone answer me?


If you put y = 0 into (x + y)/(x - y) = 1 you'll get x/x = 1, which is true for any non-zero x, not only for x = 1. For example, try x = -1.

Hope it helps.
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Re: M17-19 [#permalink]

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New post 10 Aug 2017, 04:22
I missed the case in which x= + 1 and -1 both....silly one...
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Re: M17-19 [#permalink]

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New post 17 Sep 2017, 04:44
Bunuel wrote:
r19 wrote:
can someone explain me more ?
my logic
x+y=x-y
y = 1/2

from statement 2, x>0 means x can 1/2 , 1 , 2

so answer is E


x+y=x-y
x cancels out: y = -y
2y = 0
y = 0.



Hi Bunuel

Cant we substitute y=0 back into the statement to find value of x ?

Thanks

Kudos [?]: [0], given: 38

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Re: M17-19 [#permalink]

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New post 17 Sep 2017, 04:48
amargad0391 wrote:
Bunuel wrote:
r19 wrote:
can someone explain me more ?
my logic
x+y=x-y
y = 1/2

from statement 2, x>0 means x can 1/2 , 1 , 2

so answer is E


x+y=x-y
x cancels out: y = -y
2y = 0
y = 0.



Hi Bunuel

Cant we substitute y=0 back into the statement to find value of x ?

Thanks


Check this: https://gmatclub.com/forum/m17-184125.html#p1847599
_________________

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 124614 [0], given: 12079

Re: M17-19   [#permalink] 17 Sep 2017, 04:48
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M17-19

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