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In this lesson, shopping for cell phone plans provides a motivating context where students will compare and interpret the properties of two functions represented in different ways. The lesson starts with students examining and discussing an input/output table to identify rate of change and y-intercept. Students will then be hooked by the talk of cell phones. Students will be assigned a group. Each group will solve two different problems involving cell phone plans. They have to determine the rate of change, y-intercept, and the total cost after two years. Students will be assigned homework and have a summative assessment the next day.
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