In Chicago, drivers that are not carpoolers pay a fee to use the express lanes on the freeways in order to increase traffic flow. The toll varies
directly with the number of cars on the road. The table shows a sample of possible tolls.
Toll
($)
1.00
2.00
3.00
4.00
Traffic Volume (Vehicles per
hour)
521
1,042
1,563
2,084
Write an equation in slope-intercept form that relates the toll x and traffic volume y.