This PowerPoint lesson will teach students to interpret the equation y = mx + b as linear and also gives examples of equations that are not linear. After going through the 6 examples, students look at each example again to determine whether or not they are functions. Answers for all problems are given. This PowerPoint can be used in a whole group setting, small group setting, or independent setting. It is great for students with auditory processing disorders as there is no sound. Students can go at their own pace. They can also click to see explanations on how outputs were discovered for inputs, if needed. For those students who are confident with substituting inputs to get outputs, they can easily skip this part for each example. Graphs are also shown to further prove when equations are linear or nonlinear. At 2 times, students are directed to do some work on their paper. At the end, students are encouraged to review any parts they need to, and there is a blank for you to fill in for students who are comfortable with the information presented. Please rate and leave feedback!