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Leading adult education through support for and the effective application of technology.

Illuminations - Resources for Teaching Math: Amazing Profit

Example Web Site and/or Technical Equipment Required


Website Example:

Tech Product Equipment

Computer(s), Internet access, projector, optional document camera

Activity Description

Students use equations to determine eBay profit on new technology. EBay is an online auction agency. For a limited time after a "new" product’s street release date, it is possible to track the profit that sellers make for auctioning them on eBay. Students use previous data of selling prices to derive a linear equation for the "closing bid price" on a product.

This lesson is designed for students who already know how to determine linear equations from a coordinate graph. Its purpose is to illustrate an application of understanding relationships and trends.


  1. Read through the online activity/lesson plan .
  2. Gather necessary materials such as markers and rulers
  3. Print the Amazing Profit Activity sheet (pdf) for students


Be sure to check online for detailed Lesson Plans.

Teacher Tips

  • Use the links at the bottom of the lesson for further resources.
    - Questions for Students
    - Assessment Options
    - Extensions
    - Teacher Reflection

Select subjects and subcategories


  • Algebra
  • Consumer Math

Social Studies

  • Economics
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OTAN activities are funded by contract CN200091-A2 from the Adult Education Office, in the Career & College Transition Division, California Department of Education, with funds provided through Federal P.L., 105-220, Section 223. However, OTAN content does not necessarily reflect the position of that department or the U.S. Department of Education.