This Problem Set is a part of the Lesson 7, Unit 1, Grade 7. Students identify the same value relating the measures of 𝑥 and the measures of 𝑦 in a proportional relationship as the constant of proportionality and recognize it as the unit rate in the context of a given situation. Students find and interpret the constant of proportionality within the contexts of problems. It is important for students to recognize that unit rate is found from the ratio ratio 𝐵: 𝐴.