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

4x + 5x + 12 = -6 (given) 9x + 12 = -6 (simplify) 9x = -18 (subtraction) x = -2 (addition) Which reason is incorrect? A) addition B) given C) simplify D) subtraction
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1 vote
4x + 5x + 12 = -6 (given)

9x + 12 = -6 (simplify)
9x = -18 (subtraction)
x = -2 (addition)

Which reason is incorrect?
A) addition
B) given
C) simplify
D) subtraction

User Joao Cenoura
by
7.7k points

2 Answers

4 votes

Answer:

Addition

Explanation:

USA Testprep

User Jay Sidri
by
8.3k points
5 votes
The last step is incorrect. Addition is NOT used. Instead, division is used since both sides were divided by 9

So the answer is choice A) addition.
User Pbojinov
by
8.0k points
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