A pizza with one topping costs $12. Each additional topping costs $3 more. Write an explicit formula for the situation.

Answer 1

C = 12 + 3(T-1) where C= total cost, T=number of toppings

C = 12 +3T -3

C =9+3T

C = 3T + 9. Graphically that's a straight line with slope 3 and y (or C) intercept of 9, if you graph it

on the x and y axes. with dollars on the y axis and number of toppings on the x axis

C=12 if T=1, 3(1)+9 = 12

C=15 if T=2 3(2) +9 = 15