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XY=X^2? 1)XY=Y^2 2)X^2=Y^2

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Senior Manager
Joined: 02 Feb 2004
Posts: 345
Followers: 1

Kudos [?]: 23 [0], given: 0

XY=X^2? 1)XY=Y^2 2)X^2=Y^2 [#permalink]  07 Aug 2004, 06:24
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XY=X^2?

1)XY=Y^2
2)X^2=Y^2
Senior Manager
Joined: 19 May 2004
Posts: 291
Followers: 1

Kudos [?]: 8 [0], given: 0

XY=X^2 ? => Is X(X-Y)=0 ?
And the answer is Yes if X=0 or X=Y.

1) Y(Y-X)=0. Y=0 OR X=Y. Insufficient.

2) X=Y OR X=-Y. Insufficient.

Together => X=Y. Sufficient.

C.
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