Question

The cost of renting a game at the video store can be described by the function y=5x+4

, where y is the total cost and x is the number of days. If Justin has $18 to spend, what is the maximum number of days that he can rent a game if tax is not considered

Answer 1

2 days

Explanation:

Use the given formula

y = 5x + 4

The information:

y is the money spent

x is the number of days

It is known that Justin spent $18

so now just substitute in that value

$18 = 5x + 4

and simplfiy by inverse operations

18 = 5x + 4

-4 -4

14 = 5x

/5 /5

2.8 = x

As per this problem, one can infer that renting a game is done by days, and will be charged in days, hence renting a game for 0.8 days is pointless

meaning that the final answer is 2 full days