Use the given data for problem 8 and 9. Find each indicated value in order to find the equation of the regression line. X 2 4 5 6 y 7 11 12 20 8) Set up a table and use the formula for b to find the value of b. Round to one decimal place. 8) 9) Find the value of a, and write the equation of the regression line. Round to one decimal place.