The points A A\,A and B B\,B have coordinates (−2,k)(-2, k)(−2,k) and (3k−10,2)(3k - 10, 2)(3k−10,2) where k k\,k is a constant. Given the gradient of AB AB\,AB is −12\displaystyle -\frac{1}{2}−21
Show that k=4k = 4k=4
Find the equation of the line that passes through A A\,A and BBB.
Find the equation of the perpendicular bisector of ABABAB. Give your answer in the form ax+by+c=0ax + by + c = 0ax+by+c=0
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.