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The joint equation of lines y=xa n dy=-x...

The joint equation of lines `y=xa n dy=-x` is `y^2=-x^2,` i.e., `x^2+y^2=0` Statement 2: The joint equation of lines `a x+b y=0` and `c x+dy=0` is `(a x+b y)(c x+dy)=0` , wher `a , b , c , d` are constant.

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