The unit rate needs to be identified here. Given that the cost is $24 in 2 hours, we can set up a proportion:
24 / 2 = 12
In one hour, the cost is $12. We can apply this to the other numbers of hours:
12 • 3 = 36, so in 3 hours, the cost is $36.
12 • 4 = 48, so in 4 hours, the cost is $48
and so on. When graphed, this will result in a diagonal but increasing line.
