The gradient of a line gives the rate of change. Although graphs in real life may not always be straight lines, the principle of using gradients as a rate of change is useful.

Working with the general equation of a straight line, 𝑦 = 𝑚𝑥 + 𝑐, use the interactive activity to see what a graph looks like when plotted. Select values for 𝑚, the gradient, and ...