The points A A\,A and B B\,B have coordinates (−1,k+2)(-1, k + 2)(−1,k+2) and (2k−3,13)(2k - 3, 13)(2k−3,13) where k k\,k is a constant. Given the gradient of AB AB\,AB is 13\displaystyle \frac{1}{3}31
Show that k=7k = 7k=7
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.