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Home > CC3 > Chapter 8 > Lesson 8.1.2 > Problem 8-21


The choir is planning a trip to the water park, and the parents are trying to determine how much to charge each child. The cost to use a school bus is $350. Complete the table at right, graph your results, and then answer parts (a) and (b) below.  

  1. Think back to your work with proportions. Is this a proportional relationship?

    To complete the table, divide by the number of students.

    Graphs of proportional relationships can pass through the point . Does your graph look like it will pass through ?

  1. Is there an association between the number of students and the cost per student? If so, describe it. Consider the form, direction, and outliers in your description.

Number of  
Students on  
the Trip

 Bus Cost per
Student ($)

  • For every student added, the trip costs less for everyone.

There is a non-linear negative association.

Use the eTool below to help complete the table and graph the problem.
Click the link at right for the full version of the eTool: 8-21 HW eTool