This Instructional Activity is a part of the Lesson 27, Unit 4, Grade 8. Ask students to summarize the nature of the solutions for each of the Exercises 1-3. Students should be able to state clearly what they observed in Exercise 1 and Exercise 2. So far, our work with systems of linear equations has taught us that 1. If the lines defined by the equations in the system are parallel, then the system has no solution.