Which of the following expressions is equivalent

to 7x + 9y - 6 - 3y + 4?

A 7x + 4y

B 11xy

C 7x + 6y - 2

D. 7X+4

C

Explanation:

All that is needed to do is combine like terms. The sign in front of each term stays with it. Like + 9y-3y=6y, 7x would isolate itself since it has not other term to follow. And - 6+4=-2. This would all lead to C. 7x+6y-2.