Posted by **Anonymous** on Saturday, May 9, 2009 at 6:34pm.

3. The linear equation

y=0.15x+.079

represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for example, as it is the first year in the study. Similarly, 2005 would be year 9, or x = 9.

c) What is the slope (or rate of change) of this equation?

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