Question

Solve the equation a = m – n for the variable n.
A. n = a + m
B. n = m – a
C. n = a – m
D. n = – m – a

Answer 1

Step-by-step explanation:

Get n by itself. It doesn't matter how you do it, you'll get the same answer whether you subtract m or add n to the other side. You just need to have a positive n by itself on one side of the equation.

$a=m-n\\n+a=m\\n=m-a$

Answer:

B. $n=m-a$