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What is the Value of X^2 - y^2 I x + y = 2x II x + y = 0

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What is the Value of X^2 - y^2 I x + y = 2x II x + y = 0 [#permalink] New post 06 Aug 2005, 08:42
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What is the Value of X^2 - y^2

I x + y = 2x

II x + y = 0

please answer with explnations As i am not sure about this Q

thanks
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 [#permalink] New post 06 Aug 2005, 11:49
D it is...

X^2 - Y^2 can be written as (x+y)(x-y)

1) x+y=2x

then y=x,

plug in Y=x

(x+x)(x-x)=0

sufficient

2) x+y=0

plug it in...stem becomes 0....

sufficient...
  [#permalink] 06 Aug 2005, 11:49
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