In this culminating lesson for the unit, students interpret representations of linear relationships in real-world contexts (MP2). They study graphs that represent linear situations, encountering lines with positive, negative, and zero slopes graphed on the same set of axes for the first time. Students work with equations written in both and formats, identifying situations when one form of equation may provide more contextual information. In this activity, students solidify what it means to be a solution to an equation by recalling how to substitute values in an equation or by looking at whether points lie on or off the line.