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Jamila wants to play a game called “Guess My Line.” She gives you the following hint: “Two points on my line are and .”  

  1. What is the growth rate of her line? A graph of the line may help.

    Growth rate: when grows by , grows by .

  2. What is the -intercept of her line?

    The -intercept is where the line crosses the -axis.

    One strategy is to use the slope triangle to continue the line and then simply read the -intercept (where the line crosses the -axis) right off the graph.

    -intercept .

  3. What is the equation of her line?

    Use the rate of growth and the -intercept to write an equation for the line.

    the rate of growth
    the -coordinate in the -intercept

Use the eTool below to complete the graph and help solve each part.
Click on the link at right for the full eTool version: