Instructional Activity# Writing Relationships from Two Points

Lesson 12. Unit 2. Grade 8 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 12, Unit 2, Grade 8. In this activity, they pursue this work but the scaffold of the given slope triangles has been removed. Once students draw appropriate slope triangles, this is an opportunity to practice and consolidate learning. In addition, students use the equation (satisfied by points on the line) to check whether or not specific points lie on the line. Note that the y-intercept was intentionally left off of this diagram, so that students who may have seen some of this material are discouraged from jumping straight to y=mx+b and encouraged to engage with thinking about similar triangles.