Question

A linear graph of parking fees in dollars based on hours parked has the points (2, 20) and (6, 44). How would you interpret the slope of the graph as the rate of change in the parking fee for each additional hour of parking?
A. The parking fee rises by $8 with each additional hour.
B. The parking fee rises by $10 with each additional hour.
C. The parking fee rises by $6 with each additional hour.
D. The parking fee rises by $7.33 with each additional hour.

Answer 1

Slope = (44 − 20)/(6 − 2) = 24/4 = 6.
So the fee increases by $6 for each additional hour — answer C.