The equation of the pair of lines joini...

The equation of the pair of lines joining the origin to the points of intersection of `x^2+y^2=9 and x+y=3`, is

`x^(2)+(3-y)^(2)=9`

`(3+y)^(2)+y^(2)=9`

`x^(2)-y^(2)=9`

`xy=0`

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