School Improvement in Maryland
Algebra and Data Analysis - Instructional Strategies
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Classroom Activities for Teaching Students the Rubrics Criteria

HOT SEAT ACTIVITY
PROBLEM 2

Video club A charges an annual fee of $10 plus $2 per video. Video club B simply charges $3 per video. Use a graph, table or equations to represent each club’s cost. When is the cost for renting the videos the same for both clubs? Use mathematics to justify your answer.

  • I need to find out how much each video club charges for 2, 4, 6, … videos to see if I find a pattern.

    (Analysis)

  • Y= total cost      X= number of videos
          Club A      Y= 10 + 2X
          Club B      Y= 3X

    (Representation)

  • Since the 2 lines intersect at (10,30), I know that either club would have the same cost of $30 when you rent 10 videos.

    (Justification)
     

    • Instructional Strategies