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For which of the following is x = 5 NOT a solution (a) 12 + 3x = -15 (b) 2x − 6x = -20 (c) 18 = 13 + x (d) -4x = x − 25
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20 votes
For which of the following is x = 5 NOT a solution

(a) 12 + 3x = -15
(b) 2x − 6x = -20
(c) 18 = 13 + x
(d) -4x = x − 25

User James Cadd
by
3.2k points

2 Answers

7 votes
the first one, if you plug in 5 to the others, they come out even. A does not.

12 + 3(5) = -15
12 + 15 = -15
27 = -15
0 = -42

this is incorrect, making A your answer.
hope this helps!
User Mascoj
by
3.9k points
9 votes

Answer:

A) x= -9

B) x=5

C) x=5

D) x=5

Explanation:

User Picomon
by
3.2k points
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