A routine activity such as pumping gasoline can be related to many of the concepts studied in this text. Suppose that premium unleaded costs $3.75 per gal. Work Exercises in order.

Why does the equation from Exercise 72 satisfy the conditions for direct variation? In the context of variation, what do we call the value of a?

Data from in Exercise 72

Using function notation, if ƒ(x) = ax + b represents the line from Exercise 71, what are the values of a and b?

Data from in Exercise 71

Write the slope-intercept form of the equation of the line on which the two points lie.

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