Question

Subtract.

8x - 8y +9
5x - 8y -z
____________

A) 3x + z + 9
B) 3x - 16y - z + 9
C) 3x - z + 9

Answer 1

(8x - 8y + 9) - (5x - 8y - z) = 3x + z + 9

8 - 5 = 3
-8 - (-8) = 0
9 - 0 =9
0 - (-z) = z

so it is written 3x +z +9

Answer 2

Subtract.

8x - 8y +9

5x - 8y -z

____________

A) 3x + z + 9

B) 3x - 16y - z + 9

C) 3x - z + 9

Answer: A