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

 It is currently 03 May 2015, 03:59

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If x does NOT equal -y, does (x-y)/(x+y) > 1? (1) x >

Author Message
TAGS:
Senior Manager
Joined: 11 Feb 2007
Posts: 359
Followers: 1

Kudos [?]: 40 [0], given: 0

If x does NOT equal -y, does (x-y)/(x+y) > 1? (1) x > [#permalink]  21 Apr 2007, 07:46
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If x does NOT equal -y, does (x-y)/(x+y) > 1?

(1) x > 0
(2) y < 0

Highlight! -> Can I multiply both sides by (x+y) and have it x-y > x+y?

Manager
Joined: 18 Apr 2007
Posts: 121
Followers: 1

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

DS is not my strong suit, but I'm going to take a stab at this:

The only way (x-y)/(x+y) can be greater than 1 is if (x-y) is greater than (x+y). The only way this can happen is if y is negative and x is positive. Therefore,

A) x>0 - this tells us nothing about y - Not Sufficient
B) y<0 - this tells us nothing about x - Not Sufficient

Is my reasoning logical?
Intern
Joined: 28 Dec 2006
Posts: 13
Followers: 0

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

Quote:
The only way this can happen is if y is negative and x is positive.

This is not true.

Ex 1: x = 1, y = -3/4
(1 + 3/4)/(1 - 3/4) = (7/4)/(1/4) = 7

Ex 2: x=1, y=-3
(1 + 3)/(1-3) = 4/-2 = -2

I believe the answer is E.
Current Student
Joined: 28 Dec 2004
Posts: 3391
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 181 [0], given: 2

I am going with E on this..unless we know how big Y is compared to X we are not sure of the sign of the equation..
Intern
Joined: 28 Dec 2006
Posts: 13
Followers: 0

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

Quote:
Highlight! -> Can I multiply both sides by (x+y) and have it x-y > x+y?

You cannot because (x+y) could be a negative number.
Manager
Joined: 18 Apr 2007
Posts: 121
Followers: 1

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

You are right...I stand corrected. Thanks for the insight.

B
Similar topics Replies Last post
Similar
Topics:
4 If xy > 0, does (x - 1)(y - 1) = 1? 5 09 Feb 2014, 23:30
If xy > 0, does (x-1)(y-1) = 1? 2 03 Dec 2010, 21:47
8 If xy > 0 does (x-1)(y-1)=1 ? 19 03 Aug 2010, 04:25
If x != -y, is x-y/x+y > 1 ? 5 28 Sep 2009, 15:51
xy >0 does (x-1)(y-1) =1 x+y=xy x=y spoiler below the 4 07 Aug 2007, 13:40
Display posts from previous: Sort by