Least square solutions/ infinitely many solutions/ Linear Algebra

Find the least square solutions, the least square error vector and the least square error of the linear system 3x_1+2x_2-x_3=2 ; x_1-4x_2+3x_3=-2 ; x_1+10x_2-{7x}_3=1. Least square solutions/ infinitely many solutions/ Linear Algebra Explanation in Tamil