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 ...

Let equation of the line which is the perpendicular bisector be \(y = mx + c\) It goes through (0, 2). Gradient of line joining (5,5) and (-5, -1) = \(\frac{\text{difference in y values}}{\ ...