1. Warm Up 12/3/2018 Solve by substitution. 𝒙−𝟐𝒚=𝟏𝟎 𝒙+𝟑𝒚=𝟓

2. Elimination Using Addition and Subtraction (Part A)
Ch. 6-3
Elimination Using Addition and Subtraction
(Part A)

3. A method for solving systems of equations
by adding or subtracting to eliminate a
a variable.

4. Add
subtract
coefficients
Solve
Substitute
solve

14. Warm Up 12/4/2018 Solve by elimination. 1. 𝒚=𝟑𝒙+𝟒 𝒚=𝒙−𝟐
1. 𝒚=𝟑𝒙+𝟒
𝒚=𝒙−𝟐
Solve by elimination.
𝟒𝒚=−𝟑−𝒙
𝟕𝒙−𝟒𝒚=𝟒𝟑

15. Example 1: 𝑥+3𝑦=6
2𝑥−7𝑦=−1

16. Example 2: x+3y=12
2𝑥+𝑦=5

17. Example 8: x+3y=9
5𝑥+4𝑦=10

18. Example 9: x+9y=−10
7𝑥+10𝑦=−1