pair-st-lines

Question: The lines joining the points of intersection of line $x+y=1$ and curve ${{x}^{2}}+{{y}^{2}}-2y+\lambda =0$ to the origin are perpendicular, then the value of $1/\sqrt{10}$ will be



1) 1/2
2) –1/2
3) $1/\sqrt{2}$
4) 0
Solution: Explanation: No Explanation
Equation of lines joining the origin to the point of intersection of a curve and a line and Distance between the pair of lines

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