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Is x^2 = xy? (1) x^2 - y^2 = (x+5)(y-5) (2) x=y

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Is x^2 = xy? (1) x^2 - y^2 = (x+5)(y-5) (2) x=y [#permalink] New post 14 Apr 2007, 22:41
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Is x^2 = xy?
(1) x^2 - y^2 = (x+5)(y-5)
(2) x=y
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Re: DS set 1 [#permalink] New post 14 Apr 2007, 23:38
overtherainbow wrote:
Is x^2 = xy?
(1) x^2 - y^2 = (x+5)(y-5)
(2) x=y


statement 1 says that (x-y)(x+y)=(x+5)(y-5). so by comparing R.H.S with L.H.S we get the values of x and y to be -5 and -5. so statement 1 is sufficient.

Statement 2 says that x=y therefore it is sufficient.

So answere is D. Both the statements are sufficient.

Javed.

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 [#permalink] New post 15 Apr 2007, 18:11
oa i got is b(it might not be right)
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 [#permalink] New post 15 Apr 2007, 21:29
You are right ... the answer should be (B)

You can't compare LHS and RHS for polynomial equations to arrive at solutions.
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  [#permalink] 15 Apr 2007, 21:29
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