Learning goals: Teacher Facing Create the graph of a proportional relationship given only one pair of values, by drawing the line that connects the given point and (0, 0). Identify the constant of proportionality from the graph of a proportional relationship. Interpret (orally and in writing) points on the graph of a proportional relationship. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.2 Introducing Proportional Relationships, Grade 7.