Problema Solution
The cost y
(in dollars) to rent a pickup truck is proportional to the number x
of hours that the pickup truck is rented. It costs $100 to rent the truck for 4 hours. Write an equation that represents the cost to rent a pickup truck for x
hours.
Answer provided by our tutors
Since y is proportional to x we have:
y = kx, where k is constant
For x = 4 hr we have y = $100 that is:
100 = 4k
4k = 100 divide both sides by 4
k = 100/4
k = 25
The equation that represents the cost to rent a pickup truck for x hours is:
y = 25x