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Is x > y ?

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Intern
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Joined: 16 Feb 2010
Posts: 28
Followers: 0

Kudos [?]: 7 [0], given: 0

Is x > y ? [#permalink]

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New post 01 May 2010, 07:25
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A
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C
D
E

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Question Stats:

75% (02:16) correct 25% (01:04) wrong based on 3 sessions

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Is x > y ?

(1) x + y > 0
(2) x^2 – y^2 > 0
[Reveal] Spoiler: OA
Senior Manager
Senior Manager
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Joined: 30 Aug 2009
Posts: 286
Location: India
Concentration: General Management
Followers: 3

Kudos [?]: 148 [0], given: 5

Re: Is x > y ? [#permalink]

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

please help...


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
Re: Is x > y ?   [#permalink] 01 May 2010, 09:02
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