The point of the form (a,-a) always lies on: (a) x = a (b) y=-a (c) y = x (d) x + y 0
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Answer is (d) part because
x+y=0
a+(-a)=0. (as given the value of x and y are a and -a)
a-a=0
0=0
L.H.S.=R.H.S.
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