The linear equation

y=0.15x + 0.79

represents an estimate of the average cost of gas for year x starting in 1997. (“Consumer price index,” 2006). The year 1997 would represented by x=1, for example, because it is the first year in the study. Similarly, 2005 would be 9, or x=9.

a. What would be represented by x=4?

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