SUB! How can we use the properties of algebra to figure out the intersection of two lines WITHOUT graphing? (Day 2 of 3)

Each day, students complete a warm-up that usually consists of spiraling the previous day's material, in addition to older material.  Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts. Today's warmup worksheet is WU63 Solve systems using substitution 2.

For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

Today's homework file (HW63 Solve systems using substitution day 2) contains 7 problem related to this lesson, as well as some spiraled review.  I also give the kids the answers to the problems on page 2 of the assignment.