A medical study on the systolic blood pressure readings (top number) on men over 40 years old results in the data below. The x-value is the number of years past 40 years old and the y-value is the systolic blood pressure reading. x y 8 63 11 77 14 86 17 90 20 140 Find the least squares regression line modeling this data. What is the slope of the regression line? Round your answer to three decimal places.