Question

A luxury car rental company charges $150 per day in addition to a flat fee of $50 for insurance.

Write an equation that represents the cost, f(x), (in dollars) to rent the car for x days. This equation should be in slope-intercept form.

Answer 1

y = total cost
You start at a cost of $50 at zero days, so $50 is your y-intercept (b).
Your rate of daily rental is your slope (m), and it goes up at $150 / 1 day.

Therefore, for y=mx+b, you would write
y = $150x + $50, where x>or = 0

Answer 2

y = $150x + $50,