Straight Lines

Given equation of line or and circle Equation of the line joining the origin to the intersection of line and circle is Since, lines are at right angles.

Let the variable line be Given, the algebraic sum of the perpendicular from the points and to this line is zero




This is a linear relation between and . So, the equation represents a family of straight line passing through a fixed point. Comparing and We obtain The coordinates of fixed point are .

Answer (c) pair of straight lines

Slope of

Slope of
Now, coordinates of

By section formulaa

Required equation is given as