Answer: 12x - 8y
Explanation:
Focus on the x terms for now. We have 10x and 2x. Saying 10x+2x is like saying "10 boxes + 2 boxes = 12 boxes". We can replace "boxes" with "x" to say 10x+2x = 12x
The y terms are a similar story, and -5y-3y = -8y. It might help to set up a number line to see why -5-3 turns into -8.
