The line l1 l_1\,l1 has gradient 4 and passes through (3,8)(3, 8)(3,8).
l2 l_2\,l2 is perpendicular to l1 l_1\,l1 and passes through (0,−2)(0, -2)(0,−2). Find an equation for l2l_2l2.
260 exam-style questions on Edexcel A Level Maths Straight Line Graphs, covering 5.1 y = mx + c, 5.2 Equations of Straight Lines, 5.3 Parallel and Perpendicular Lines, 5.4 Length and Area, and 5.5 Modelling with Straight Lines. Each one has a worked solution and a mark scheme showing where the marks go.