Warm Up 12/3/2018 Solve by substitution.

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Solving Systems of three equations with three variables Using substitution or elimination.

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Presentation transcript:

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

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

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

Add subtract coefficients Solve Substitute solve

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. 2. 𝟒𝒚=−𝟑−𝒙 𝟕𝒙−𝟒𝒚=𝟒𝟑

Example 1: 𝑥+3𝑦=6 2𝑥−7𝑦=−1

Example 2: 9x+3y=12 2𝑥+𝑦=5

Example 8: 3x+3y=9 5𝑥+4𝑦=10

Example 9: 5x+9y=−10 7𝑥+10𝑦=−1