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9-90.

Use the rule  to answer the questions below.  

  1. What is the slope of the line?

    Pick two points on the line and find the change in -values over the change in -values to find the slope.
    What do you get? Does this value correspond with a value in the rule above?

  2. Where does the line cross the -axis?

    Where on the graph does the line cross the -axis?
    Also, logically, the graph will cross the -axis when .
    Using the rule, can you calculate this value?
    What do you get? Does this value correspond with a value in the rule above?

Use the eTool below to help you with this problem.
Click the link at right for the full version of the eTool: