Question

You charge
$5.00 to wash
cars. To wax
cars, you
charge an extra
$2.00 a minute.
You earned $37.
How long did
you wax the car
for?

Answer 1

Lets turn this into a formula:

5 is the constant, 2 is the rate of change, and 37 is the total.

37 = 2x + 5 where x is the number of minutes.

Subtract 5 from both sides:

37 - 5 = 2x

32 = 2x

Divide 2 from both sides:

16 = x

This means that you spent 16 minutes washing the car.

I hope this helps! :)