Elimination 5 - mulitply both equations

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Objective

SWBAT solve systems linear systems of equations by elimination – multiply both equations.

Big Idea

Yikes! What happens when you need to multiply both equations to use elimination?

Lesson Author

Jeff Li MTP

New York, NY

Grade Level

Eighth grade

Subjects

Math

Algebra

Systems of Equations and Inequalities

Standards

8.EE.C.8

Analyze and solve pairs of simultaneous linear equations.

8.EE.C.8a

Understand that solutions to a system of two linear equations in two variables correspond to points of intersection of their graphs, because points of intersection satisfy both equations simultaneously.

8.EE.C.8b

Solve systems of two linear equations in two variables algebraically, and estimate solutions by graphing the equations. Solve simple cases by inspection. For example, 3x + 2y = 5 and 3x + 2y = 6 have no solution because 3x + 2y cannot simultaneously be 5 and 6.

MP2

Reason abstractly and quantitatively.

MP6

Attend to precision.

MP7

Look for and make use of structure.

Warm-up

10 minutes

WU70 Elimination 5 reviews solving systems of equations by graphing.

Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts. For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

Play of the Day

40 minutes

Huddle

10 minutes

Homework

15 minutes

5 - 11 HW70 Elimination 5 includes problems related to this lesson, four from this unit and one review problem. I also give the kids the answers to the problems.

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Algebra I » Systems of Linear Equations