. Question 6 0/2 pts 9 5 4 0 Details Let Z = (2, -2, -1) be a point in R'. Find the closest point to Z that lies on the plane given by x- y + z= 0. Submit Question. Question 7 0/2 pts 9 5 4 0 Details Find the least squares regression line for the following set of points in R2: (1, -1), (-3, -1), and (1, -3). Let the regression line be given by y = ma + b. Enter the values for m and b below. m b = Submit