The cost of parking in a parking garage in Chicago is represented by the equation y x = + 15 20 where y is the total cost (in dollars) and x is the time (in hours). The table
shows the total cost to park in a parking garage in Denver. Which city’s parking garage
charges more per hour and by how much more? After how many hours would parking in
Both cities cost the same?

Hours, x 2 3 4 5
Cost, y 43 51 59 67