Teacher presentation materials. Unit: 7.2 Introducing Proportional Relationships (Grade 7). 7.2 Introducing Proportional Relationships In this unit, students learn to understand and use the terms “proportional,” “constant of proportionality,” and “proportional relationship,” and recognize when a relationship is or is not proportional. They represent proportional relationships with tables, equations, and graphs. Students use these terms and representations in reasoning about situations that involve constant speed, unit pricing, and measurement conversions. Read More Lessons Resources Assessments Lessons Representing Proportional Relationships with Tables 1 One of These Things Is Not L