Question

Solve for b.

3a + 2b = c

b = c - (3a - 2)
b = (c - 3a)/2
b = (3a - c)/2

Answer 1

Add -3a to both sides.

3a+2b+ −3a=c+ −3a

Divide both sides by 2.

Your answer is:

b= $\frac{-3}{2}$a + $\frac{1}{2}$ c

Answer 2

3a + 2b = c
2b = c-3a
b = (c-3a)/2

Your answer is b = (c-3a)/2, i.e.,option B.