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In the lesson linked below, students will work together to graph and compare the rates of three different phone plans and use that information to determine when the costs will be the same for each plan. Students will solve the different systems of linear equations posed in the phone problem by using substitution.
Lesson guidelines: http://auhsdmath.pbworks.com/w/file/fetch/60768829/8_0Teach_Dir_Systems%282%29.pdf
Henry’s dilemma: http://auhsdmath.pbworks.com/w/file/fetch/60768830/8_1HenrysDilemma%282%29.pdf
Henry’s dilemma (graph): http://auhsdmath.pbworks.com/w/file/fetch/60768831/8_2Graph_Henrys_Dilemma%282%29.pdf
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