The cost to fill a car's tank with gas and get a car wash is a linear function of the capacity of the tank. The costs of a fill-up and a car wash for three different customers are shown in the table. Write an equation for the function in slope-intercept form. Then, find the cost of a fill-up and a car wash for a customer with a truck whose tank size is 27 gallons.
Tank size (gal) (x) Total cost ($) f(x)
7 15.35
12 24.35
16 31.55
f(x) = 0.56x + 1.53
Cost for truck = $16.65
f(x) = 1.90x + 3.25
Cost for truck = $54.55
f(x) = 1.80x + 2.75
Cost for truck = $51.35
f(x) = 1.60x + 2.25
Cost for truck = $45.45
