Algebra II Workbook - Wayne County Public Schools

LESSON
2.2
CONTINUED
EXAMPLE 3
NAME _________________________________________________________ DATE ____________
Practice with Examples
For use with pages 75–81
Slope as a Rate of Change
Six years ago a house was purchased for $89,000. This year it was
appraised at $125,000. Find the average rate of change and use it to
determine the value after 9 years.
SOLUTION
Average rate of change
Change in value
Change in time
$125,000 $89,000
6 yrs
$36,000
6 yrs
$6000 per year
Over a 9-year period, the value changed 9$6000 $54,000. The value
after 9 years was $89,000 $54,000 $143,000.
Exercises for Example 3
9. On a typical summer evening the temperature was 90F at 7:00 P.M.
At 8:00 A.M. the next morning the temperature was 70.5F. What is
the average rate of change in temperature? Estimate what the
temperature was at midnight.
Chapter 2
Copyright © McDougal Littell Inc.
All rights reserved.
Algebra 2 27
Practice Workbook with Examples