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xy>0 ? 1) x-y>-2 2) x-2y<-6

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xy>0 ? 1) x-y>-2 2) x-2y<-6 [#permalink] New post 28 Oct 2006, 18:56
00:00
A
B
C
D
E

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xy>0 ?

1) x-y>-2
2) x-2y<-6
VP
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Joined: 28 Mar 2006
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Re: DS inequalities [#permalink] New post 28 Oct 2006, 20:16
Natalya Khimich wrote:
xy>0 ?

1) x-y>-2-------------------------------(1)
2) x-2y<-6
--------------------(2)

1) is clearly not enough

Also 2 isnt enough

From 1 and 2 we can say its is xy>0

rewrite (2) as
2y-x>6 ------------------(3)

Add (1) and(3)
y>4

Substitute this val in (1)

x-y(somevalue>4) >-2

Lets suppose y=4 then x has to be minimum 2

So both are +ve and hence

it is C
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 [#permalink] New post 29 Oct 2006, 00:59
  [#permalink] 29 Oct 2006, 00:59
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xy>0 ? 1) x-y>-2 2) x-2y<-6

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