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Is x > y ?

Author Message
Intern
Joined: 16 Feb 2010
Posts: 26
Is x > y ?  [#permalink]

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01 May 2010, 07:25
1
2
00:00

Difficulty:

55% (hard)

Question Stats:

53% (01:08) correct 47% (00:51) wrong based on 32 sessions

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Is x > y ?

(1) x + y > 0
(2) x^2 – y^2 > 0

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/is-x-y-1-x-y ... 57719.html
Senior Manager
Joined: 30 Aug 2009
Posts: 275
Location: India
Concentration: General Management
Re: Is x > y ?  [#permalink]

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01 May 2010, 09:02
poohv005 wrote:
Is x >y ?
(1) x + y > 0
(2) x^2–y^2> 0

stmnt1 - x= 2 y = 0 then x + y > 0 and x>y
x= 1 and y =2 then x + y > 0 and x<y hence insuff

stmnt2 - x= 2 and y = 0 then x^2–y^2> 0 and x>y
x= -5 and y = 4 then x^2–y^2> 0 but x<y hence insuff

taking both together we have x + y > 0 and x^2–y^2> 0
==> x^2–y^2> 0 = (x+y)(x-y) > 0
==> we have (x+y) is >0 so x-y>0 or x>y. hence C
Math Expert
Joined: 02 Sep 2009
Posts: 49206
Re: Is x > y ?  [#permalink]

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05 Jul 2018, 05:23
poohv005 wrote:
Is x > y ?

(1) x + y > 0
(2) x^2 – y^2 > 0

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/is-x-y-1-x-y ... 57719.html
_________________
Re: Is x > y ? &nbs [#permalink] 05 Jul 2018, 05:23
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