Question

What reason is incorrect?

4x + 5x + 12 = -6 (given)
9x + 12 = -6 (simplify)
9x = -18 (subtraction)
x = -2 (addition)
-
A) addition
B) given
C) simplify
D) subtraction

Answer 1

A) addition

Explanation:

4x + 5x + 12 = -6 (given) this is the given info

9x + 12 = -6 (simplify) to simplify, combine like terms, 4x + 5x = 9x

9x = -18 (subtraction) you are subtracting 12 from both sides to cancel out 12

x = -2 (addition) you are not adding, you are dividing by 9 to get x alone

you are not adding