Question

Solve M = 2x + 3y for y

Answer 1

M-2x = 3y
y = (M-2x)/3

Answer 2

subtract 2x from both sides
M-2x=2x-2x+3y
3y=M-2x
divide both sides by 3
\[\frac{\cancel{3}y}{\cancel{3}}=\frac{M-2x}{3}\]
\[y=\frac{M-2x}{3}\]