A two-step equation has two different operations. To solve a two-step equation, use inverse operations to undo each operation in reverse order.
Solve 4y + 3.5 = 12.5 . Check the solution.
Undo addition. Subtract 3.5 from each side.
Undo multiplication. Divide each side by 4.
y = 2.25
To check the solution, substitute 2.25 for y in the equation.