Question

Which equation has a solution of n equals negative one ?

A)One half n minus six equals negative seven

B)Negative six n plus eight equals negative two

C)Two times n minus eight equals negative eighteen

D)Two n plus twelve minus three n equals fifteen

Answer 1

1/2n - 6 = -7
1/2n = -7 + 6
1/2n = -1
n = -1/(1/2)
n = -1 * 2
n = -2
not A.

-6n + 8 = -2
-6n = -8 - 2
-6n = - 10
n = 5/3
not B

2n - 8 = -18 or 2(n - 8) = -18
2n = -18 + 8 n - 8 = -9
2n = -10 n = -9 + 8
n = -5 n = -1
not C This is it

2n + 12 - 3n = 15
-n + 12 = 15
-n = 15 - 12
-n = 3
n = -3
not D

At first I didn't think the answer was here. The answer is C, but only when parenthesis are inserted in the equation.