Introduce slack variables as necessary and then write the initial simplex Maximize z= X1 +5X2 tableau for the given linear programming problem. subject to x 1 + 2 x2 5 12 7 x1 + x2 59 3 x1 + 2 x2 58 with x1 20, X2 20 . . . Complete the initial simplex tableau. X2 S1 $2 S3 Z 2 1 0 O 7 0 0 O 9 2 0 0 O 0 0 0 O