Identify two points ((x_1, y_1)) and ((x_2, y_2))
Compute the change in the input: (Delta x = x_2 – x_1)
Compute the change in the output: (Delta y = y_2 – y_1)
Compute the rate of change: (dfrac{Delta y}{Delta x} = dfrac{y_2 – y_1}{x_2 – x_1})
If needed, state units as “output units per input unit”