SUB! How can we use the properties of algebra to figure out the intersection of two lines WITHOUT graphing? (Day 3 of 3)

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SWBAT solve systems of linear equations by substitution.

Big Idea

More substitution! Get kids to isolate a variable BEFORE solving. Getting trickier...


10 minutes

Today, students complete the Solve systems using substitution Day 3 warm-up that consists of spiraling the previous day's material, in addition to older material. In today's warm-up, I spiral two skills -- applying systems to real-life situations, and then using graphing to solve a system.  It's important to give a little bit more time to the warm-up than usual today.

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.



10 minutes


15 minutes

The 5 - 5 HW64 Solve systems using substitution day 3 homework file includes problems related to this lesson, as well as spiraled review.  I also give the kids the answers to the problems.