x = number of miles driven

f(x)= .23x + 37.50

f(x)= 85.75

**The solution to this problem is contextual:**

If you plan on having the rental car more than 2 days, than the bus is more economical. However, if the trip is 2 days or less the car would appear more economical.

If it is a one day trip, the car is more economical. This is true only if you travel less than 210 miles. If you go over 210 miles in 1 day than the bus becomes more economical.

1 day trip:

85.75= .23x + 37.50

48.25 = .23x

209.8 = x

2 day trip:

85.75 = 2 (.23x+ 37.50)

85.75 = .46x +75

10.75 = .46x

23.4 = x