In this lesson, we learn how to find the rate of change in a word problem. By identifying the independent and dependent variables, we can determine the change in the dependent variable over the change in the independent variable. The example given involved federal vehicle emission standards over a four-year period, and we learned to be careful to note whether the change is going up or down and to adjust the rate of change accordingly, resulting in a final answer of negative one-half.
Finding the rate of change of a word problem
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Questions answered by this video:
How do I find the rate of change from a word problem?
In 2003, federal vehicle emission standards allowed 4 hydrocarbons released per mile driven. By 2007, the standards allowed only 2 hydrocarbons per mile driven. What was the rate of change from 2003 to 2007?
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In this lesson, the teacher shows an example of how to find rate of change from a word problem.