1. Solving Two-Step Equations Teacher: Jimmy Frost

2. What is a Two-Step Equation? An equation written in the form Ax + B = C

3. Examples of Two-Step Equations • 3x – 5 = 16 • y/4 + 3 = 12 • 5n + 4 = 6 • n/2 – 6 = 4

4. Steps for Solving Two-Step Equations • Solve for any Addition or Subtraction on the variable side of equation by “undoing” the operation from both sides of the equation. • Solve any Multiplication or Division from variable side of equation by “undoing” the operation from both sides of the equation.

5. Addition  Subtraction Opposite Operations Multiplication  Division

6. Helpful Hints? • Identify what operations are on the variable side. (Add, Sub, Mult, Div) • “Undo” the operation by using opposite operations. • Whatever you do to one side, you must do to the other side to keep equation balanced.

7. Ex. 1: Solve 4x – 5 = 11 4x – 5 = 15 +5 +5 (Add 5 to both sides) 4x = 20 (Simplify) 4 4 (Divide both sides by 4) x = 5 (Simplify)

8. Try These Examples • 2x – 5 = 17 • 3y + 7 = 25 • 5n – 2 = 38 • 12b + 4 = 28

9. Check your answers!!! • x = 11 • y = 6 • n = 8 • b = 2

10. Ready to Move on?

11. Ex. 2: Solve x/3 + 4 = 9 x/3 + 4 = 9 - 4 - 4 (Subt. 4 from both sides) x/3 = 5 (Simplify) (x/3)  3 = 5  3 (Mult. by 3 on both sides) x = 15 (Simplify)

12. Try these examples! • x/5 – 3 = 8 • c/7 + 4 = 9 • r/3 – 6 = 2 • d/9 + 4 = 5

13. Check your answers!!! • x = 55 • c = 35 • r = 24 • d = 9

14. Time to Review! • Make sure your equation is in the form Ax + B = C • Keep the equation balanced. • Use opposite operations to “undo” • Follow the rules: • Undo Addition or Subtaction • Undo Multiplication or Division

15. That’s All! Good Bye