1. Skill Check over Solving Systems by Graphing after Homework Check
(No calculators!)

2. Homework Check

3. Solve Systems by Graphing
Skill Check
Solve Systems by Graphing

4. Solve Systems of Equations by Substitution

5. Steps
One equation will have either x or y by itself, or can be solved for x or y easily.
Substitute the expression from Step 1 into the other equation and solve for the other variable.
Substitute the value from Step 2 into the equation from Step 1 and solve.
Your solution is the ordered pair formed by x & y.
Check the solution in each of the original equations.

6. Solve by Substitution
1. 3x + 2y = -12
y = x - 1
1. (-2, -3)

7. Solve by Substitution
2. x = -3y - 9
3x - 4y = 27
2. (3, -4)

9. Solve by Substitution
3. x = 5y + 10
2x - 10y = 20
3. Many/Infinite solutions

10. Solve by Substitution
4. 6x – 3y = -18
4x - y = 10
4. (8, 22)

11. Solve by Substitution 5.
5. (12, -1)

12. HW
Substitution WS