# A construction company charges $15 per hour for debris removal, plus a one-time fee for the use of a trash dumpster. The total fee for 9 hours of service is$195. How do you find the total fee y for any number of hours x?

$y = 15 x + 60$
We have a function where the total fee, y, that equals an hourly fee of $15 per hour (x hours) and a one-time fee, f, that we haven't been given. So what we know at this point is: $y = 15 x + f$Once we know f, we'll have the equation. But we can solve for f by dropping in the charge for 9 hours: $195 = 15 \left(9\right) + f$$f = 195 - 135 = 60$So we can find the general formula for y: $y = 15 x + 60\$