Question

Which equation has a solution of n = 4?

A, 6 + n = 24
B, 5n = 54
C, 12 - n = 16
D, 7n = 28

Answer 1

Explanation:

1. 7n=28
2. divide both side by 7
3. n=28\7
4. n=4

Answer 2

D. 7n = 28

Explanation:

Let's substitute 4 for n in each equation to check if it the resulting equation is correct:

`6+n=24\\ 6+4=24\\ 10\\eq 24\rightarrow \text{Incorrect!}`

`5n=54\\5(4)=54\\20\\eq54\rightarrow\text{Incorrect!}`

`12-n=16\\12-4=16\\8\\eq16\rightarrow\text{Incorrect!}`

`7n=28\\7(4)=28\\28=28\rightarrow\text{Correct!}`

Therefore the answer is D