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

It is currently 15 Sep 2014, 16:58

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 = ( x^2 - y^2)/(x-y) where x not equal to y, then what

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 11 Jun 2007
Posts: 649
Followers: 3

Kudos [?]: 47 [0], given: 0

GMAT Tests User
If y = ( x^2 - y^2)/(x-y) where x not equal to y, then what [#permalink] New post 21 Nov 2007, 11:32
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
If y = ( x^2 - y^2)/(x-y) where x not equal to y, then what is the value of y ?

(1) x + y = 3
(2) x - y = 2
Director
Director
avatar
Joined: 11 Jun 2007
Posts: 649
Followers: 3

Kudos [?]: 47 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Nov 2007, 12:07
young_gun wrote:
A, y=3?


I chose A but OA is different.
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 361

Kudos [?]: 1783 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
 [#permalink] New post 21 Nov 2007, 13:00
Expert's post
D

y = ( x^2 - y^2)/(x-y)=(x+y)(x-y)/(x-y)=x+y ==> x=0; for any y.

1. x + y = 3 ==> y=3 suff
2. x - y = 2 ==> y=-2 suff
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 159 [0], given: 2

GMAT Tests User
 [#permalink] New post 21 Nov 2007, 13:08
I believe the OA is wrong then..

(x-y)(x+y)/(x-y)=y

y=x+y

x+y=3

y=3

sufficient
Director
Director
avatar
Joined: 11 Jun 2007
Posts: 649
Followers: 3

Kudos [?]: 47 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Nov 2007, 15:55
Can someone look at this problem? This is from GMATClub Challenges
http://gmatclub.com/tests/m/02/#q25

Also, is it possible for the variable y to have two different values for 2 cases?
Director
Director
User avatar
Joined: 08 Jun 2007
Posts: 583
Followers: 2

Kudos [?]: 69 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Nov 2007, 16:27
eyunni wrote:
Can someone look at this problem? This is from GMATClub Challenges
http://gmatclub.com/tests/m/02/#q25

Also, is it possible for the variable y to have two different values for 2 cases?



yes it is possible that you may end up with different values for 2 cases.

In this case it should be D.

1) y = x + y = 3

2) y = x + y => x - y + y = 0 => y = -2
Manager
Manager
avatar
Joined: 03 Sep 2006
Posts: 233
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Nov 2007, 18:41
Late, but D.
Agree with walker (same approach)
  [#permalink] 21 Nov 2007, 18:41
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic If xy≠0 and x^2*y^2-xy=6, which of the following could be y Baten80 3 16 Jan 2012, 10:26
1 Experts publish their posts in the topic If xy ≠ 0 and x2y2 – xy = 6, which of the following could be naaga 2 25 Feb 2011, 07:23
If xy ≠ 0 and x^2y^2 – xy = 6, which of the following could Jcpenny 3 09 Nov 2008, 19:47
If xy ≠ 0 and x^2y^2 xy = 6, which of the following apollo168 3 22 Aug 2006, 05:32
5 Experts publish their posts in the topic If xy not equal 0 and x^2*y^2 -xy = 6, which of the followin sperumba 6 18 Jan 2006, 19:15
Display posts from previous: Sort by

If y = ( x^2 - y^2)/(x-y) where x not equal to y, then what

  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®.