All straight line graphs have an equation that can be written in the form 𝑦 equals 𝑚𝑥 add 𝑐, where 𝑚, the coefficient of the 𝑥 term, is the gradient or slope of the line.

In order to work with gradients and straight lines successfully, a good understanding of coordinates and linear graphs is needed ... gradient to work out the slope of a roof.