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by DeepakR » Wed Apr 22, 2009 4:59 pm
Substitute the values and solve it,
2(1)^2 + (-2) [x+y]=0
and (1+(-2))(x-y)=-1(x-y)=y-x

Ans.) C

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by tdadic84 » Wed Apr 22, 2009 4:59 pm
is the OA C?
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by lilu » Wed Apr 22, 2009 8:17 pm
Put the known values in the equation:
(2-2)(x+y)+(1-2)(x+y)=-1(x-y)=y-x
C
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