Question

It costs $315 to book a DJ for 3 hours. It costs $525 to book the same DJ for 5 hours. Write an equation that represents the cost y in dollars of booking a DJ for x hours.

Answer 1

y = 105x

Explanation:

$315 ÷ 3 = $105 per hour

$525 ÷ 5 = $105 per hour

Constant of Proportionality is $105 in both cases.

y = kx

y = 105x