Question

Please help!! I'm confused

Answer 1

9x - 9y + 8

Explanation:

Simplify means to solve, but in this context it means to "shorten" it by adding the like terms together:

7x - 9y + 15 + 2x - 7

rearrange to make it easier, optional

7x + 2x - 9y + 15 - 7

add like terms

9x - 9y + 8