You have to RISE before you RUN. Your goal is to find the change in the height of the line over the horizontal distance of the line. The diagram shown below illustrates this.
M stands for slope.
Just like we saw before rise over run slope. Runinches Rise tanangle Roof Pitch Rise Run 12 Slope Rise Run 100 Example. 165 3 Find the slope of the line. Slope is the rise over the run the change in y over the change in x or the gradient of a line.