Answer:
-7x-10y
Explanation:
1. Combine like terms
= x+−y+−8x+−9y
= (x+−8x)+(−y+−9y)
= −7x+−10y
- 7x - 10y
You add the “like” terms.
x - y - 8x - 9y
x - 8x And - y - 9y
-7x - 10y
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