m\(_1\) = \(\frac{y_2 - y_1}{x_2 - x_1}\) The given points are -1, 3 and 3, 1 m\(_1\) = \(\frac{1 - 3}{3 - (-1)}\) = \(\frac{-2}{4}\) = - \(\frac{1}{2}\) The perpendicular gradient(m_2\) = m\(_1\) x m\(_2\) = -1 = - \(\frac{1}{2}\) x m\(_2\) = -1 m\(_2\) = -1 x - \(\frac{2}{1}\) = 2