In this lesson, students represent proportional relationships using equations of the form . The activities revisit various contexts from earlier in the unit and continue presenting values in tables. Students see that the relationship in each table can be represented by an equation of the form , where is the constant of proportionality that relates the two quantities. As students calculate values in the tables and write equations relating the quantities, they practice looking for and expressing regularity in repeated reasoning (MP8).

The last activity is optional because it provides an opportunity for additional practice by revisiting another familiar context.