Variable: $175=P $40=L $375=TB
x=TB-P/L
Equation: $375-$175/$40=5
This means that the amount of hours you paid for is 5 hours.
It could be:
2/4
4/8
8/16
3/6
5/10
6/12
I'm guessing you mean which equation Equals -9
In each equation you are needing to get rid of X so you divide on both sides
A) -45=5x
-45/5=x
-9=x
and I double checked to make sure nothing else equaled -9 so Your answer Is A
Hope this helped!