7.3 Solving Systems of Equations by Elimination Using Multiplication Solve by Elimination Example Problems Practice Problems

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 2

Multiply, Then Use Elimination Example 3

Multiply, Then Use Elimination Example (Cont.) 4

Another Example  An untrue solution identifies and Inconsistent System  That means the lines won’t cross… 5

Practice Problems  Page 391 Problems (odd) 6