# word problem help!!!!!!!

*label*Mathematics

*timer*Asked: Apr 11th, 2015

**Question description**

A car rental company charges an initial fee plus an additional fee for each mile driven. The charge depends on the type of car: economy or luxury.

The charge

(in dollars) to rent an economy car is given by the function , where is the number of miles driven. The charge (in dollars) to rent a luxury car is given by the function . Let be how much more it costs to rent a luxury car than an economy car (in dollars). Write an equation relating to . Simplify your answer as much as possible.