A graph with number of hours on the x-axis and total cost (dollars) on the y-axis. Points are at (3, 18.5), (4, 23), (5, 27.5) and (6, 32).
An indoor trampoline park has an admission fee, plus an hourly charge. The graph displays the total cost from 3, 4, 5, and 6 hours of play. Determine the hourly charge, assuming the relationship is linear.
Rate of change = $
per hour