Luke gets pizza delivered from the same local pizza parlor every Thursday. This week, he ordered 3 pizzas for his family and spent $32.75. Last week he ordered 4 pizzas and spent $41.50. Assume the price for each pizza is the same.

a) Does the pizza parlor charge a delivery fee? Explain.


b) Write an equation describing the total amount Luke spends, d, to get p pizzas delivered.