Find two points for example (9,17) and (6,12) then you put into this formula: Slope=(Y-y)/(X-x). Let the first coordinate be the capital letters (Y and X) and let the second coordinate be the lower-case letters (y and x). Now we "plug it in" into the equation. Slope=(9-6)/(17-12) = 3/5. So the slope is 3/5.