With percents: percent error and discounts and markups
(show all work)
original price: $500
discount:
sale price: $175
what is the discount in percentage (i. e. 20% off, 85% off,

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.