Choose two points on the line: ((x_1, y_1)) and ((x_2, y_2))
Use the slope formula: (m = frac{y_2 – y_1}{x_2 – x_1})
Subtract the y-values to find the rise
Subtract the x-values to find the run
Divide the rise by the run
Simplify the fraction if needed
If the line is horizontal, the slope is (0)
If the line is vertical, the slope is undefined