Asalesperson has to drive 500 miles. for the first three hours she drove at 65 mi/h. for the next two hours she drove at 55 miles per hour. how many more miles does she have to drive?

       Short answer= 195
 
First, you do 65 times 3 and that gives you 195 miles. 
Then you do 55 times 2 and that gives you 110 miles.

You add both answers and get 305.
Do 500-305 and you get =195.

The solution to the system of equations (-2,2)