**The following table shows the distance traveled in miles,y, by
a car after burning x gallons of gasoline.**

**x (gallons)** |
**5** |
**10** |
**15** |
**20** |

**y (miles)** |
**84** |
**169** |
**255** |
**338** |

**a). Make a scatterplot of the data. Could a linear function be
used to model this data?**

b). Find values *a* and *b* so that *f(x) = ax + b *models
the distance traveled on *x* gallons of gasoline. Graph *f*
and the data in the same viewing rectangle.

c). Interpret the slope of the graph of *f*.