1. Lesson 4-3 Solving systems by elimination
Objective:
To solve a system by the third final method of elimination

2. Solving by Elimination
When you use the elimination method to solve a system of linear equations, align all like terms in the equations.
Then determine whether any like terms can be eliminated because they have opposite coefficients.

3. Solving by Elimination
Solve by elimination.
3x – 4y = 10
x + 4y = –2

4. Solving by Elimination
Solve by elimination.
y + 3x = –2
2y – 3x = 14

5. Solving by Elimination
Solve by elimination.
2x + y = –5
2x – 5y = 13

6. Solving by Elimination
Solve by elimination.
2x + y = –5
2x – 5y = 13

7. Solving by Elimination
Solve by elimination.
x + 2y = 11
–3x + y = –5

8. Solving by Elimination
Solve by elimination.
x + 2y = 11
–3x + y = –5

9. Solving by Elimination
Solve by elimination.
–5x + 2y = 32
2x + 3y = 10

10. Solving by Elimination
Solve by elimination.
3x + 2y = 6
–x + y = –2

11. Solving by Elimination
Solve by elimination.
2x + 5y = 26
–3x – 4y = –25

12. Solving by Elimination
Solve by elimination.
2x – 5y = –5
2x – 5y = 13

13. Solving by Elimination
Solve by elimination.
3x – 6y =9
x – 2y = 3