Elimination 2 - add or subtract only

3 teachers like this lesson
Print Lesson


SWBAT solve linear systems of equations using elimination, Day 2.

Big Idea

If we don't have additive inverses, what should we do? Rather than "change the signs," push kids to understand that you are multiplying an equation by -1.


10 minutes

Today, students complete WU67 Elimination 2 as a warm-up that 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


10 minutes


15 minutes

5 - 8 HW67 Elimination 2 includes 7 problems that consist of problems related to this lesson, as well as spiraled review.  I also give the kids the answers to the problems.