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4 3 solving linear systems by elimination

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hisema01

This document discusses solving linear systems by elimination. It provides 4 steps: 1) look for like terms with opposite coefficients, 2) if none, multiply an equation by a constant, 3) add equations to eliminate a variable, 4) plug the solution back into one equation to solve for the other variable. It includes 3 examples of solving systems using this elimination method and prompts the reader to solve additional systems on their own.

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4-3 SOLVING LINEAR SYSTEMS BY ELIMINATION
HOW TO USE ELIMINATION 1. Look for like terms with opposite coefficients. 2. If none, multiply one or both equations by a constant. 3. Add equations to eliminate one variable. Solve for the other. 4. Plug in solution to solve for other variable. Example: x + 3y = -2 x – 3y = 16
EXAMPLE 2 ï‚¢Solve: -5x + 2y = 13 5x + y = -1
YOU TRY! Solve: 2x – y = 9 4x + y = 21
EXAMPLE 3 Solve: -6x + 5y = 25 -2x – 4y = 14
YOU TRY! ï‚¢Solve: 3x + y = 11 6x + 3y = 24

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4 3 solving linear systems by elimination