Question

1. (-8x + 7y) + 9y + (-8x)

Explanation:

Step1: Remove parentheses

$-8x + 7y + 9y - 8x$

Step2: Group like x-terms

$(-8x - 8x) + 7y + 9y$

Step3: Combine x-terms

$-16x + 7y + 9y$

Step4: Group and combine y-terms

$-16x + (7y + 9y) = -16x + 16y$

Answer:

$-16x + 16y$