Answers:
- a) The function is y = 0.75x+39
- b) The cost is $189
==================================================
Explanation:
Part a)
- x = number of miles driven
- y = total cost
If we ignore the $39 rental fee, then it costs 0.75x dollars to drive x miles. However, we cannot ignore that fee which means we tack it on to get 0.75x+39 to represent the total cost.
Therefore, y = 0.75x+39 is the cost function
If your teacher insists you use other variables (instead of x and y), then be sure to follow those instructions.
------------------
Part b)
Plug in x = 200 to find y
y = 0.75x+39
y = 0.75*200+39
y = 189 dollars is the total cost
