11.12 Use the Gauss-Seidel method (a) without relaxation and (b) with relaxation (λ-0.95) to solve the following system to a tolerance ofe, = 5%. If necessary, rearrange the equations to achieve convergence. 3x1 + x2 + 12x3 = 50 6x1 + 9x2 + x3 = 40