Question

The ice skating rink charges an hourly fee for skating and $3 to rent skates for the day. Gillian rented skates and skated for

3 hours and was charged $21. Which equation represents the cost, c(X), of ice skating as a function of x, the number of
hours of skating?

Answer 1

Answer: C(x) = 3x + 3

Explanation:

C(x) = mx + b

Given: when x = 3 hours, C(x) = $21 total charge, b = $3 skate rental

21 = 3m + 3

18 = 3m

6 = m

Answer for any given x is: C(x) = 3x + 3