Find all School-related info fast with the new School-Specific MBA Forum

It is currently 02 Sep 2015, 13:52
GMAT Club Tests

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If Y is an integer and Y = |X| + X, is Y = 0 X<0 Y<1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
User avatar
Joined: 10 Feb 2009
Posts: 27
Location: Connecticut
Followers: 0

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

If Y is an integer and Y = |X| + X, is Y = 0 X<0 Y<1 [#permalink] New post 11 Mar 2009, 05:58
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If Y is an integer and Y = |X| + X, is Y = 0

X<0
Y<1

Just a little confused about this..Thanks :)
Senior Manager
Senior Manager
User avatar
Joined: 19 Aug 2006
Posts: 250
Followers: 2

Kudos [?]: 8 [0], given: 0

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 07:01
Allana25 wrote:
If Y is an integer and Y = |X| + X, is Y = 0

X<0
Y<1

Just a little confused about this..Thanks :)


Y = |x|+x

1. x<0
since x<0, then whatever values you take for x, y will always be 0.
e.g.
|-5|-5=5-5=0
|-1|-1=1-1=0
suffic.

2. y<1
since y can never be a negative number because y=|x|+x, then y>=0. Since it's given y<1, then y=0.
suffic.

The answer should be D.
Intern
Intern
User avatar
Joined: 10 Feb 2009
Posts: 27
Location: Connecticut
Followers: 0

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

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 07:56
Thats what I got. But I saw this question at another forum and they said A. I think D is the correct answer.
Director
Director
avatar
Joined: 01 Aug 2008
Posts: 770
Followers: 4

Kudos [?]: 261 [0], given: 99

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 09:25
peraspera wrote:
Allana25 wrote:
If Y is an integer and Y = |X| + X, is Y = 0

X<0
Y<1

Just a little confused about this..Thanks :)


Y = |x|+x

1. x<0
since x<0, then whatever values you take for x, y will always be 0.
e.g.
|-5|-5=5-5=0
|-1|-1=1-1=0
suffic.

2. y<1
since y can never be a negative number because y=|x|+x, then y>=0. Since it's given y<1, then y=0.
suffic.

The answer should be D.



in second case, put x = 0.1 you get y = 0.2 which is less than 1 ..and put x = -0.1, y = 0. which is also less than 1 so case 2 is wrong.

Answer should be A.
Director
Director
avatar
Joined: 01 Aug 2008
Posts: 770
Followers: 4

Kudos [?]: 261 [0], given: 99

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 09:28
ugimba wrote:
peraspera wrote:
Allana25 wrote:
If Y is an integer and Y = |X| + X, is Y = 0

X<0
Y<1

Just a little confused about this..Thanks :)


Y = |x|+x

1. x<0
since x<0, then whatever values you take for x, y will always be 0.
e.g.
|-5|-5=5-5=0
|-1|-1=1-1=0
suffic.

2. y<1
since y can never be a negative number because y=|x|+x, then y>=0. Since it's given y<1, then y=0.
suffic.

The answer should be D.



in second case, put x = 0.1 you get y = 0.2 which is less than 1 ..and put x = -0.1, y = 0. which is also less than 1 so case 2 is wrong.

Answer should be A.



oh ...Y is integer here so ... didn't see that ... I guess you can't substitute 0.1 for x .. I think D should be good then.
Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 903
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 362 [0], given: 18

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 10:22
when x<0, |x| = -x...so the first eq becomes
Y = -x + (-x) = -2x ?????
Expert Post
1 KUDOS received
GMAT Tutor
avatar
Joined: 24 Jun 2008
Posts: 1180
Followers: 321

Kudos [?]: 1013 [1] , given: 4

Re: DS - is Y = 0 [#permalink] New post 11 Mar 2009, 16:02
1
This post received
KUDOS
Expert's post
Economist wrote:
when x<0, |x| = -x...so the first eq becomes
Y = -x + (-x) = -2x ?????


When x is negative, you don't replace x with -x; if x is negative, then -x is a positive number. If x is negative, there is a negative sign 'inside' of x.

Now, if x is negative, you can replace |x| with -x, because if x is negative, -x will produce the 'positive equivalent' of x.
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Manager
Manager
avatar
Joined: 02 Mar 2009
Posts: 138
Followers: 1

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

Re: DS - is Y = 0 [#permalink] New post 15 Mar 2009, 01:35
Oh yes..answer is D.

But thanks Ian for this last bit. It made me see |x| in a different light. Never thought you could write |x| as -x when x is negative. Makes perfect sense.

Thanks.
Re: DS - is Y = 0   [#permalink] 15 Mar 2009, 01:35
Display posts from previous: Sort by

If Y is an integer and Y = |X| + X, is Y = 0 X<0 Y<1

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.