This graph shows the cost of hiring a ladder for various numbers of days. Using the points (1, 10) and (9, 34), the gradient = change up change right or change in y change in x = 34 10 9 1 = 24 8 = 3.

Learn and revise how to plot coordinates and create straight line graphs to show the relationship between two variables with GCSE Bitesize Edexcel Maths.