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

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SVP
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Joined: 24 Aug 2006
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Is x2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) x = y [#permalink] New post 09 Nov 2006, 10:14
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:04) correct 0% (00:00) wrong based on 2 sessions
7. Is x2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y
Intern
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Re: 1000 DS [#permalink] New post 09 Nov 2006, 10:23
kidderek wrote:
7. Is x2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y


I think B is enough to answer the question

What is question looking for is
x2 - xy = 0
x (x-y) = 0

so either x = 0 or x - y = 0 => x = y
so B gives us the answer.
Senior Manager
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Re: 1000 DS [#permalink] New post 09 Nov 2006, 10:52
2. is suff as obvious
1. for x2=xy,either x=0 or x=y
x2-y2=(x+5)(x-5) holds for (x,y)=(5,5)and(-5,-5) and for these values,x2=xy holds
so 1 is also suff.

choice d.

what's the oa???
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 [#permalink] New post 09 Nov 2006, 11:27
I'm very sorry, the first part is x^2

7. Is x^2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y
  [#permalink] 09 Nov 2006, 11:27
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