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9-39.

A gallon of milk that cost $ a year ago now costs $.

Remember the independent variable () represents years, while the dependent variable () represents price.

There are two points in this problem.
Point : one year ago cost $
Point : now costs $.

  1. If the cost is increasing linearly, what is the growth rate? If the cost kept increasing in the same way, what will the milk cost years from now?

Read the Math Notes box in Lesson 2.3.2 on finding equations of lines with 2 points.

Remember that slope is 

Growth rate is $ per year. The price in years will be $.

  1. If the cost is increasing exponentially, what is the growth rate? What will the milk cost in years?

Review problem 8-121 for a method of solving this problem.

Remember there should be equations (system of equations) and use the Equal Values Method.

The multiplier is (%). The price in years will be $.