Question

SoIve 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

B. n = m - a

Explanation:

`a=m-n\qquad\text{subtract}\ a\ \text{from both sides}\\\\a-a=m-n-a\\\\0=m-n-a\qquad\text{add}\ n\ \text{to both sides}\\\\0+n=m-n+n-a\\\\n=m-a`