Remember, to find the equation of a line you need a point \((a,b)\) and the gradient \(m\). This determines the gradient of the required line. Use B\((6,3)\) and \(m\). The perpendicular bisector ...

Watch this video to learn about the equation of a straight line. Since we are given 2 points that already lie on the line, using the formula as before, we need to calculate the gradient first.