The following table shows the percentage of a three-person American family’s weekly income spent on gasoline for the indicated year.
YEAR t | 1966 | 1976 | 1986 | 1996 | 2006 |
Percentage Spent on Gasoline P | 5.5 | 4.4 | 3.0 | 2.7 | 4.2 |
Source: St. Louis Post-Dispatch.
a. Use a plot of the data to determine whether a linear function is a suitable model for these data.
b. If a linear model is suitable, find the linear function that best fits the data.
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