1. Warm-up

2. Systems of Equations: Substitution

3. Solving by Substitution 1)Solve one of the equations for a variable. 2)Substitute the expression from step 1 into the other equation. 3)Solve the new equation. 4)Substitute the value found in step 3 into either equation containing both variables. 5)Check the proposed solution in the original equations.

4. Solve by Substitution

8. Warm-Up

9. Day 2: Substitution Solving for a variable first

10. Solving by Substitution 1)Solve one of the equations for a variable. 2)Substitute the expression from step 1 into the other equation. 3)Solve the new equation. 4)Substitute the value found in step 3 into either equation containing both variables. 5)Check the proposed solution in the original equations.

11. Solve by Substitution