Solve this

A sandwich store charges a delivery fee to bring lunch to an office. One office pays $40.50 for 5 meatball sandwiches. Another office pays $66.50 for 9 meat ball sandwiches

A. How much does each meatball sandwich add to the cost of delivery?

B. What is the delivery fee

A sandwich store charges a delivery fee to bring lunch to an office.

Delivery cost - D

Meatball sandwich cost - M

One office pays $40.50 for 5 meatball sandwiches.

40.50 = 5M + D

Another office pays $66.50 for 9 meat ball sandwiches

66.50 = 9M + D

A. How much does each meatball sandwich add to the cost of delivery?

D = 40.50 - 5M = 66.50 - 9M

40.50 - 5M = 66.50 - 9M

9M - 5M = 66.50 - 40.50

4M = 26.00

M = 6.50

B. What is the delivery fee

D = 40.50 - 5M = 40.50 - 5 (6.50) = 40.50 - 32.50 = 8.00

Check

66.50 = 9M + D = 9 (6.50) + 8 = 58.50 + 8.00 = 66.50