For a set of 5 data points (x_i, y_i), i=1,2,3,4,5 with x_i=1.5,2.1,3.8,4.2,7.6 and y_i=2.4,4.1,5.2,7.5,8.2, least-squares regression is employed to find the fitting coefficients. What are the fitting coefficients?