How do you figure percent as slope?

Your question is a bit confusing. I can show slope as a fraction, decimal number or percent. A slope of a line from two points is the change in Y (delta Y) divided by the change in X (delta X). If my change in Y = -20, and my change in X is 100 (let's say I lost 20 pounds in 100 days), the slope is -20/100 or -0.20, which is the same as -20%.