Regressively calculate the bottle usage. Using data about the amount of bottled water and soft drinks consumed an educational video shows pupils how to determine the equation of a linear regression line. After calculating regression lines with a calculator, the presenter uses the graphing function to figure out when the two lines intersect to determine the year that water and soft drink consumption is the same.

Concepts

linear regression, systems of equations, systems of linear equations

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Instructional Ideas

• Have learners follow along with the steps using their own graphing calculators
• Lead a discussion on interpreting a numerical solution within a real problem

Classroom Considerations

• Assumes the class knows how to solve a linear system algebraically

• This video is hosted on YouTube

Pros

• Shows each step in entering the data into the calculator
• Finishes the problem with a positive statement about reducing the amount of plastic bottles in a landfill

Cons

• None

Common Core

SL.9-10.2 MP5 MP6 HSA-REI.C.6 HSS-ID.B.6.a