Slide 2:
To find an unknown quantity, work backward to solve a two-step equation. UNDO the addition OR subtraction first.
Second, multiply or divide to get the variable alone. Work Backward
Slide 3:
5n 18 -33 UNDO the Subtraction 5n 18 18 -33 18 5n -15 5n -15 5 5 n -3
Slide 4:
UNDO the Addition x 3 x 3 x 3 3 3 11 16 11 11 16 11 5 x 15
Review: 2 – Step Equations :
Review: 2 – Step Equations 2.5n + 2 = 14.50 2.5n + 2 – 2 = 14.50 – 2 2.5n = 12.50 2.5n = 12.50 2.5 2.5 n = 5