This Instructional Activity is a part of the Lesson 1, Unit 5, Grade 8. In the last module we focused on situations that were worked with two varying quantities, one changing with respect to the other according to some constant rate of change factor. Consequently, each situation could be analyzed with a linear equation. Such a formula then gave us the means to determine the value of the one quantity given a specific value of the other. There are many situations, however, for which assuming a constant rate of change relationship between two quantities is not appropriate.