The cubic root function​

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Pranza plotted point a in the coordinate plane below.

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.