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You can see that the original guess (20 inches or so) was way off. For 2015, it looks like the line will be somewhere between 5 and 10 inches! That might be “good enough”, but regression also gives you a useful equation, which for this chart is: y = -2.2923x + 4624.4.. From the lesson. Module 2: Linear Equations. A linear relationship between two variables occurs when there is a constant increase or constant decrease in one variable with respect to the other. Linear equations have the property that any change in the independent variable results in a proportional change in the dependent variable. Finding the Line of Best Fit Using a Graphing Utility. While eyeballing a line works reasonably well, there are statistical techniques for fitting a line to data that minimize the differences between the line and data values.  One such technique is called least squares regression and can be computed by many graphing calculators, spreadsheet software, statistical software, and many.