Answer:
Part A:
Company A equation: 22d + 5 = c
Company B equation: 20d + 16 = c
d - days
c - cost
Part B:
If you had rented a car from Company B for 9 days it would be less than if you rented a car from Company A for 9 days. If you plug 9 in for "d" in both equations, the total cost for Company A's would be $203, while Company B's would be $196.
Part C:
You would save $19