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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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Joined: 07 Jun 2004
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What is the Value of X^2 - y^2 I x + y = 2x II x + y = 0 [#permalink]  06 Aug 2005, 07:42
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What is the Value of X^2 - y^2

I x + y = 2x

II x + y = 0

thanks
Current Student
Joined: 28 Dec 2004
Posts: 3390
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 182 [0], given: 2

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...
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