The equation of the line of best-fit = -307507.7474 14.5573x1 1397.3157x2 where y - auto_sales x1 - household_income x2 - population We can interpret the coefficients as below: Coefficient of household income means that for a unit increase in the household income the autosales will increase by 14.5573 units keeping other things constant. Coefficient of population means that for a unit increase in the population the autosales will increase by 1397.3157 units keeping other things constant