A straight line graph with two variables is represented by an equation such as 𝑦 = 3𝑥 – 7. The equation shows the link between the 𝑥 and 𝑦-coordinates.

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 ...