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Is x^2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) x = y

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Is x^2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) x = y [#permalink] New post 21 May 2008, 00:44
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Is x^2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y
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Re: DS: X^2 [#permalink] New post 21 May 2008, 00:57
prasannar wrote:
Is x^2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y



D,

1) Assuming x2 - y2 is a typo for x^2-y^2,

(x+y)(x-y) = (-5 + y) (x - (-5) )
i.e. x =-5 & y = -5

2) is suff
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Re: DS: X^2 [#permalink] New post 21 May 2008, 01:01
alpha_plus_gamma wrote:
(x+y)(x-y) = (-5 + y) (x - (-5) )
i.e. x =-5 & y = -5


you seem right! :lol:
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Re: DS: X^2 [#permalink] New post 21 May 2008, 02:49
Given OA is B.

I too picked D and got nailed down by the OA.

Patman how did you get to B, plz explain
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Re: DS: X^2 [#permalink] New post 21 May 2008, 04:34
(1)x^2-y^2=(x+y)(x-y)=(x + 5)(y - 5)
so y=5 but no information abt x so insufficient

(2) x=y
multiplying both sides by x
x^2=xy sufficient
So answer should be B
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Re: DS: X^2 [#permalink] New post 21 May 2008, 06:52
this should be B..

x^2-y^2=(x-y)(x+y)..

we have (x+5)(y-5)... (y-5) is not equal to (x-y)

here x is negative...so insuff
Re: DS: X^2   [#permalink] 21 May 2008, 06:52
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