The cost of renting a van for one day includes a flat rental fee plus a charge for each mile the van is driven while it is rented. A van that is driven 200 miles costs $122. A van that is driven 189 miles costs $118.15. What is the flat rental fee?

Answer 1

f+200m = 122
f+189m = 118.15

Now subtract; the f's go away and you have

11m = 3.85
m = 0.35

Now, I expect you can find f, the flat fee.