Find the equation of the lines which pass through the point of intersection of the pair of lines and are at right angles to them.
From the given
Point of intersection is
Now the equation to the pair of lines parallel tot he given line passing thro'the origin is
Equation to the lines perpendicular to the above line is
Equation to the pair of lines thro' and perpendicular to the above equation is
which is the required perpendicular pair of lines.