Here, there is an equation that determine the amount charged by a painter for a paint job. The equation takes into cognizance the number of hours used and also the number of paints used.
To actually get the amount he charged, we need to substitute the number of cans and number of paints he used.
Now to get that amount, we work as follows:
Let’s say the amount is A.
For 3 paint cans and 15 hours of work, we substitute c with 3 and h with 15
