Question

Costs for a campground are $60 for

1 night, and $150 for 3 nights. Assuming
that the costs increase linearly, which
equation shows the costs, c, for n nights?

Choices:
A. c = 15n + 45
B. c = 45n + 15
C. c = 60n + 150
D. c = 180n

Answer 1

B. c = 45n + 15
If you were to pay a one time fee of $15, you can subtract 15 from both 150 and 60. This leaves you with $45 for 1 night and $135 for 3 nights, which is a proportional relationship.