# CCGPS CA 4.2.3 Example 2

- Author:
- Walch Education

- Topic:
- Function Graph

Lindsay created the table below showing the population of fruit flies over the last 10 weeks.
She estimates that the population of fruit flies can be represented by the equation . Using residuals, determine if her representation is a good estimate.

- Find the estimated population at each
*x*-value. - Evaluate the equation at each value of
*x*. - Find the residuals by finding each difference between the observed population and estimated population.
- Create a residual plot.
- Analyze the residual plot to determine if the equation is a good estimate for the population.

*CCGPS Coordinate Algebra*program. Visit www.walch.com for more information on our resources.

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