Question

What value of n makes each statement true? Suppose regular gasoline costs $2.50 per gallon. You can purchase a car wash at the gas station for $3.

a. Write an equation in slope-intercept form for the total cost y of purchasing a car wash and x gallons of gasoline.

b. Find the cost of purchasing a car wash and 8 gallons of gasoline.

Answer 1

a. y = $3 + $2.50x,

b. $23

Explanation:

y is the total cost of x gallons of gasoline at $2.50/gallon.

a. The total cost of one car wash ($23 each) plus x gallons of gas is:

a. y = $3 + $2.50x

b. The cost of a car wash and 8 gallons (x=8) is:

b. y = $3 + $2.50*(8)

y = $3 + $20

y = $23