3.2 Solving Systems by Elimination

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Presentation transcript:

3.2 Solving Systems by Elimination Learning Objective: to solve systems using elimination Warm-up (IN) 1. Simplify. No HW/INB check this week! 15y 11x -4x+5y -x+4y 17x-20y

***To solve systems by elimination: 1 – line up like terms on top of each other 2 – multiply one, or both, of the equations so that one variable will cancel 3 – add the equations vertically 4 – Solve for the remaining variable 5 – plug that value back into either of the original equations to find the other variable

-4 ( ) EX 1 – Solve by linear combination: Always write solution as an ordered pair!!!

( 3 )

5 ( ) 2 ( )

No solution! -4 ( ) All real #s

EX 2 – #40 on page 170 -2 ( ) POINT CHALLENGE! Try this… page 168

Out – Explain how to use elimination to solve the system Summary – Wow, I remember… HW – p. 169-171 #9-33 (mult of 3), 39,44, 45,47-62