1. Solve by Substitution
2x + y = 7 3x + 3y = - 3

2. Solve by Graphing
Solution: (-1, 3)

3. Questions over HW?

4. Skills Check

5. Solve Systems of Equations by Elimination

6. Steps for Elimination:
Arrange the equations with like terms in columns
Add the equations.
Substitute the value to solve for the other variable.
Check

7. EXAMPLE 1
(-1, 3)

8. EXAMPLE 2
4x + 3y = 16 2x – 3y = 8
(4, 0)

9. EXAMPLE 3
3x + 2y = 7 -3x + 4y = 5
(1, 2)

10. Classwork Solve (-2, 2) (-1, 4) (-1, 2)
Use elimination to solve each system of equations.
4. -6x – 5y = m + 4n = x + y = 1
6x – 7y = m + 2n = x – y = -3
(-1, 2)
(-2, 2)
(-1, 4)

11. Classwork (-1, 2) (1, 1) (-3, 4) Solve
Use elimination to solve each system of equations.
7. 2x + 3y = x + 3y = x – 2y = 4
-2x – 4y = x + 4y = x + 2y = 3
(-3, 4)
(-1, 2)
(1, 1)

12. Homework
Practice Worksheet