The authors of the curriculum made several decisions about how to approach mathematical ideas that likely differ from the way many people are used to approaching them. One of these ideas includes basing an understanding of the idea of the slope of a line on the properties of similar triangles. If you are unfamiliar with our approach, look through “Grade 8 Unit 2 Lesson 10: Meet Slope” to understand the approach we did take. If you had an opportunity to discuss this decision with the authors, what would you want to know more about? What are some reasons we took the approach we did, rather than an approach that might be more familiar to people?