Algebra I
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Dog Days or Dog Years?
Posted on Dec 18, 2008
Topic: Linear Functions & Equations
In this activity, students will use order pairs, table of values, and a scatter plot to determine a function that represents real world data. Students will respond to questions about dog ages in human years, domain, range, and how the slope appears to be changing in the data/graph.
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Activity Key Steps:
In this short Algebra 1 activity, students will see investigate data that takes a dog’s age and converts it into human years. They will analyze the data to determine if the claim that each dog year is equal to 7 human years is supported. Students will first use a dynamic input/output page to determine some ordered pairs of the data.
Then students will gather information from a table of values and scatter plot. They can use the Graph Trace feature to tab through the points. Students should see that two linear functions can represent the data.
After using points to calculate slope and write the equation of a line, students will graph their functions on the scatter plot. They can then use the graph to determine a dog’s age in human years beyond 8 years old.