Before you start, it may be helpful to read the guides on coordinates and graphs from Module 2 (M2 ... of the line L₂ which goes through (4, -4) and is at right angles to L₁?

coordinate. Graphs of the form \({y} = {c}\) and \({x} = {c}\), will either be a horizontal or vertical line. All the points on the horizontal line below have a y-coordinate of \(4\), so you can ...