Solve the following systems of equations, using the A\b construct, as well as the Gauss-Seidel method with a tolerance of 10-7 (in some cases convergence may not occur). (a) 2x1 x2+3x3 = 8 4x+2x2-5x3 = -9 6x13x2+x3 = 12 (b) 10x1+x2+2x3 = 3 X1+10x2 x3 = 1.5 2x1+x2+10x3 = -9 [5] [5]