When Are They the Same?

In this video lesson, students apply their knowledge of solving equations by considering real world situations. Students work with linear equations in two variables in two types of contexts: contexts like distance versus time, where there is an initial value and a rate of change, and contexts like budgets, where there is an equation constraining the possible combinations of two quantities. Students consider pairs of linear equations in each type of context and interpret the meaning of various points on and off the lines, including the point of intersection.

Grade 8, Episode 3: Unit 4, Lessons 9 & 10 | Illustrative Math