Answer these

(01) Obtain a solution by graphical method of the following linear systems, if possible. a. x1 + 2x2 = 3 b. *1 + 2 x2 = 3 X1 - X2 = 0 -2x1 - 4x2= 6 (02) Use Gaussian elimination to solve the following linear systems, if possible. a. X1 - X2+ 2x3 -X4 =-8 2x1 - 2x2+ 3x3 - 3x4 =-20 * 1+ x2+ X3 = -2 x 1 - X2 + 4x3 +3x4= 4 b. 4x1+ x2 + 2x3= 9 2x1+ 4x2 - X3 =-5 X1+ x2-3x3 =-9 c. 2x1 - 1.5x2 + 3x3 = 1 - X1 + 2x3 = 3 4x1 - 4.5x2 + 5x3 = 1 d. *1+ 2x2+ 3x3 = 6 2x1 - X2+ 2x3 = 3 3x1 + X2 + 5x3 = 9 . x1+ 3x2 - 4x3 = 4 -2x1+ x2 -X3 =-1 -X1+ 4x2 -5x3 =-3