Question

One box has a volume of 6xy + 3x and another box has a volume of 3y - 2xy. What is the sum of their volumes?

Answer 1

the sum of their volumes is 4xy + 3x + 3y

Answer 2

For this, you would add like terms

6xy+3x+3y-2xy
In this case, the only like terms are 6xy and -2xy, so lets add them
4xy+3x+3y

Answer=4xy+3x+3y