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# DS OG - inequalities

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Intern
Joined: 19 Jan 2009
Posts: 22

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03 Feb 2009, 06:35
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What would be the best algebraich way to slove this question?

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VP
Joined: 17 Jun 2008
Posts: 1474
Re: DS OG - inequalities  [#permalink]

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03 Feb 2009, 08:14
1
jairus wrote:
What would be the best algebraich way to slove this question?

For (x-y)/(x+y) > 1

Case1: either x-y > x+y and x>y and x > -y. That means, y < 0 and x > y and x > -y

or,
Case2: x-y < x+y and x < y and x < -y. That means, y > 0 and x < y and x < -y

Clearly stmt 1 and stmt2 do not provide such information.

Manager
Joined: 04 Jan 2009
Posts: 229
Re: DS OG - inequalities  [#permalink]

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03 Feb 2009, 10:18
jairus wrote:
What would be the best algebraich way to slove this question?

Clearly x+y is not equal to zero.

Let us check if (x-y)/(x+y)>1
Assume that (x+y)>0.
Then
(x-y)>(x+y) if y0 the ineuqality holds if (x+y)>0.
If(x+y)0.
Thus, insufficient.

E.

Missing piece is x>-y. This is needed to complete the problem.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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tusharvk

Re: DS OG - inequalities &nbs [#permalink] 03 Feb 2009, 10:18
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