7.3 Solving Systems of Equations by Elimination Using Multiplication

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1Solve by Elimination

Example Problems

Practice Problems

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Multiply, Then Use Elimination If the coefficients of either variable in the

first equation DO NOT match the corresponding coefficients in the second equation: Multiply one equation by a number that will

make one of the coefficients of a variable match in both equations

Follow the elimination steps

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Multiply, Then Use Elimination Example

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Multiply, Then Use Elimination Example (Cont.)

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Another Example

An untrue solution identifies and Inconsistent System

That means the lines won’t cross…

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Practice Problems Page 391

Problems 13-39 (odd)