Question

A service call to repair a washing machine costs $35 plus $20 per hour. Raphael ‘s machine took 2 hour to fix. How much did the repair cost ?
F. $50.00. G. $55.00. H. $65.00
I. $75.00

Answer 1

There is a mandatory fixed rate of $ 35 that Raphael will have to pay once the service call has been made. This fixed rate is the constant.

The per hour rate is $20. Suppose the machine took "x" hours to get fixed. Then the variable part of the repair cost will be $20x$.

Thus, Repair Cost=Fixed Rate Cost+Variable Cost

Or, $y=35+20x$ where $y$ is the total repair cost. Thus, if Raphael ‘s machine took 2 hour to fix, the repair cost is:

$y=35+20\times 2=35+40=75$ dollars.

Therefore, the last option is the correct option.

Answer 2

I. $75

Your equation would be 35 + 20x

X is the amount of hours it was fixed

35 + 20 x 2