46. A least squares plane The plane z Ar + By +C is to be"fitted" to the following points (xk,yk,zk): (0,0, 0) , (0, 1, 1) , (1, 1, 1)

, (1, 0,-1). Find the values of A, B, and C that minimize \sum_{L=1}^{4}\left(A x_{2}+B y_{2}+C-z_{b}\right)^{2} the sum of the squares of the deviations.