Pls help with this simple question

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Ineed to know the answer right now! !