Brian Monetti, I took way too many science classes in college!
The slope of a line can be calculated by Rise (vertical change) divided by Run (horizontal change.) The slope also exists as 'm' in the slope intercept form of a line Y=mX + b. This video might help a bit more: https://www.noodle.com/learn/details/205804/point-slope-to-slope-intercept-form If your Rise or Run are represented by letters, you could represent slope as a letter value (but I am not too sure where this might be the case?) Hope this helps!