This Instructional Activity is a part of the Lesson 6, Unit 5, Grade 8. Students may need a brief review of the terms related to linear equations. Ask students to summarize what they learned from the last lesson. Make sure they recall that the graph of a numerical function is the set of ordered pairs with an input of the function and its corresponding output. Also, recall that the graph of a function is identical to the graph of the equation that describes it (if there is one). Next, ask students to recall what they know about rate of change and slope and to recall that the graph of a linear equation (the set of pairs that make the equation a true number sentence) is a straight line.