Algebra 2 Monday, October 20, 2014 Complete Warm-ups Slide (see page 2 of this packet) Check in and discuss A#3.21 page 127 #1-4; 12-17; 24; 25 Discussion/Notes/Guided Practice Section 3.2 Part 2: Solve Systems by Elimination Homework: A#3.22 page 127 #6-11; 18-23 MUST see original equations and ALL work in order to receive credit

Solve a linear system of equations using the Elimination Method Q&A After this section, you will be able to: Success Criteria: Solve a linear system of equations using the Elimination Method Q&A Guided Practice Homework

Warm ups: Solve the following systems by Graphing:

Warm ups: Solve the following systems using Substitution: 1. 2𝑥−𝑦=9 2. 2𝑥+2𝑦=4 𝑥+3𝑦=−6 𝑥−2𝑦=0

Elimination Method Using this method, you eliminate one of the variables by adding or subtracting the equations. Note: when you add two true equations, the result is a new equation that is also true!

Guided Practice #1: Solve Using Elimination

b. 2𝑥−𝑦=7 3𝑥+𝑦=8

Example 2: Solve by Elimination (Multiply one equation first) 2𝑥−4𝑦=−26 3𝑥−𝑦=−24

Guided Practice #2: Solve Using Elimination a. 3𝑥−𝑦=12 5𝑥+2𝑦=20 b. 4𝑥−𝑦=6 2𝑥− 𝑦 2 =4

Example 3: Solve by Elimination (Multiply both equations first) 3𝑥−2𝑦=4 5𝑥+3𝑦=−25

Guided Practice #3: Solve Using Elimination a. 7𝑥+2𝑦=−1 4𝑥−3𝑦=−13 b. 5𝑥+4𝑦=12 7𝑥−6𝑦=40

A#3.22 page 127 #6-11; 18-23