Solve the equation Ax = b by using the LU factorization given for A. Also solve Ax = b by ordinary row reduction. 4-7-4 1 0 0 4-7 - 4 -3 A = - 4 3 3 = -1 1 0 0-4-1 b= -11 8-2-6 2-3 1 0 0 - 1 42 Let Ly = b and Ux = y. Solve for x and y. y = x = Row reduce the augmented matrix [A b] and use it to find x. The reduced row echelon form of [A b] is , yielding x = |