Elimination 1 - add or subtract only

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Objective

SWBAT solve linear systems of equations using elimination, Day 1.

Big Idea

Why does elimination work? Use sensitive nieces, peppermint bark, and gingerbread men to illustrate this mathematical concept.

Lesson Author

Jeff Li MTP

New York, NY

Grade Level

Eighth grade

Subjects

Math

Systems of Equations and Inequalities

Algebra

solving equations

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

Today's Warmup reviews the previous day's material.

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

HW66 Elimination 1 includes problems that consist of problems related to this lesson, as well as spiraled review. I also give the kids the answers to the problems.

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Algebra I » Systems of Linear Equations