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Is x > y^2 ? 1) x > y+5 2) x^2 - y^2 = 0

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Manager
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Joined: 01 Apr 2006
Posts: 172
Location: Toronto, Canada
Is x > y^2 ? 1) x > y+5 2) x^2 - y^2 = 0  [#permalink]

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New post 12 Sep 2008, 05:48
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Is x > y^2 ?

1) x > y+5

2) x^2 - y^2 = 0

--== 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!

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SVP
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Joined: 07 Nov 2007
Posts: 1728
Location: New York
Re: inequality DS  [#permalink]

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New post 12 Sep 2008, 22:20
jjhko wrote:
Is x > y^2 ?

1) x > y+5

2) x^2 - y^2 = 0



1)
x=7 y=1

x > y^2 --> 7>1 true

x=-2 y=-10
x>y^2 --> -2>100 false

insuffcient
2)
x=+-y

x=2 y=2
2>4 false
x=1/2 y=1/2
1/2>1/4 true

insufficient

combined.
x > y+5
and x=+-y
so x=-y y is negative and x is positive.
when x=2 y=-2
2>4 false
when x=1/2 y=-1/2
1/2>1/4 true
insufficient


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Director
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Joined: 23 Sep 2007
Posts: 760
Re: inequality DS  [#permalink]

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New post 13 Sep 2008, 00:16
1
jjhko wrote:
Is x > y^2 ?

1) x > y+5

2) x^2 - y^2 = 0



C

from statement 2:

|x| = |y|

from statement 1:
x > y+5

together, x must be positive and y must be negative, and y must be less than -2.5, so absolute value of y must be greater than 2.5, therefore x must be less than y^2

--== 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.
Re: inequality DS &nbs [#permalink] 13 Sep 2008, 00:16
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