It appears that, over the past 50 years, the number of farms in Canada declined while the average size of farms (in hectares) increased. The following data show five-year interval data for Canadian farms. Use these data to develop the equation of a regression line to predict the average size of a farm by the number of farms. Discuss the slope and y-intercept of the model.

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Year 1961 1966 1971 1976 1981 Number (thousands of farms) 480.88 430.50 366.11 338.55 318.36 Total Area (millions of hectares) 69.83 70.46 68.66 68.43 65.89 Average Size (hectares) 145 164 188 202 207