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# Is x+y positive? 1) x-y is positive. 2) y-x is negative

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Manager
Joined: 24 Jun 2003
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Is x+y positive? 1) x-y is positive. 2) y-x is negative [#permalink]  07 Aug 2003, 02:52
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Is x+y positive?

1) x-y is positive.
2) y-x is negative.
Manager
Joined: 24 Jun 2003
Posts: 147
Location: India
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Re: DS practice # 8 [#permalink]  07 Aug 2003, 04:41
Konstantin Lynov wrote:
Is x+y positive?

1) x-y is positive.
2) y-x is negative.

E in my opinion.

Will post explanation after some more people have tried
Manager
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re: answer [#permalink]  07 Aug 2003, 10:36
Anybody else want to have a try. Just post your answers if you are too lazy to explain. Let me do that for you in some time...

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Respect,

KL

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[#permalink]  07 Aug 2003, 11:03
(1) and (2) are the same x>y

3>1 x+y>0
3>-10 x+y<0

E
Manager
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Re: DS practice # 8 [#permalink]  07 Aug 2003, 22:16
Konstantin Lynov wrote:
Is x+y positive?

1) x-y is positive.
2) y-x is negative.

Stolyar is right. Both statements are the same: multiply (2) -x+y<0 by -1 and you will have (1) x-y>0 (Do not forget to reverse the inequality sign!). Thus, combining statement will give us no relief.

E is correct.

Well done everybody!

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Respect,

KL

Re: DS practice # 8   [#permalink] 07 Aug 2003, 22:16
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# Is x+y positive? 1) x-y is positive. 2) y-x is negative

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