What does point P on the graph represent?
After 3 hours, the runner ran 18 miles.
Which value represents the independent variable and which value represents the dependent variable? Explain your reasoning.
Time is the independent variable and miles are the dependent variable. Possible explanation: The runner's distance depends on how long he or she has been running.
Would you classify this graph as linear or non-linear? Why?
Linear. Explanations vary; encourage students to use the phrase constant rate of change.
How can you find the runner’s speed?
Possible response: Find the slope, or rate of change, of the line.
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