Solve the following problem by the two phase simplex method
Solve the following problem by the two phase simplex method. Kindly show each step:
Maximize x1 + 3x2 -x3
subject to 2x1 + x2 +3x3 >=3
-x1 + x2 >= 1
-x1 - 5x2 + x3 <=4
x1, x2, x3 >= 0
Solution
Maximize x1 + 3x2 -x3
subject to 2x1 + x2 +3x3 >=3
-x1 + x2 >= 1
-x1 - 5x2 + x3 <=4
x1, x2, x3 >= 0
Tableau #1
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
2 1 3 -1 0 0 0 0 0 0 3
-1 1 0 0 -1 0 0 0 0 0 1
-1 -5 1 0 0 1 0 0 0 0 4
1 0 0 0 0 0 -1 0 0 0 0
0 1 0 0 0 0 0 -1 0 0 0
0 0 1 0 0 0 0 0 -1 0 0
-1 -3 1 0 0 0 0 0 0 1 0
Tableau #2
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
2 1 0 -1 0 0 0 0 3 0 3
-1 1 0 0 -1 0 0 0 0 0 1
-1 -5 0 0 0 1 0 0 1 0 4
1 0 0 0 0 0 -1 0 0 0 0
0 1 0 0 0 0 0 -1 0 0 0
0 0 1 0 0 0 0 0 -1 0 0
-1 -3 0 0 0 0 0 0 1 1 0
Tableau #3
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
0.666667 0.333333 0 -0.333333 0 0 0 0 1 0 1
-1 1 0 0 -1 0 0 0 0 0 1
-1.66667 -5.33333 0 0.333333 0 1 0 0 0 0 3
1 0 0 0 0 0 -1 0 0 0 0
0 1 0 0 0 0 0 -1 0 0 0
0.666667 0.333333 1 -0.333333 0 0 0 0 0 0 1
-1.66667 -3.33333 0 0.333333 0 0 0 0 0 1 -1
Tableau #4
x y z s1 s2 s3 s4 s5 s6 p
0.666667 0 0 -0.333333 0 0 0 0.333333 1 0 1
-1 0 0 0 -1 0 0 1 0 0 1
-1.66667 0 0 0.333333 0 1 0 -5.33333 0 0 3
1 0 0 0 0 0 -1 0 0 0 0
0 1 0 0 0 0 0 -1 0 0 0
0.666667 0 1 -0.333333 0 0 0 0.333333 0 0 1
-1.66667 0 0 0.333333 0 0 0 -3.33333 0 1 -1
Tableau #5
x y z s1 s2 s3 s4 s5 s6 p
1 0 0 -0.333333 0.333333 0 0 0 1 0 0.666667
-1 0 0 0 -1 0 0 1 0 0 1
-7 0 0 0.333333 -5.33333 1 0 0 0 0 8.33333
1 0 0 0 0 0 -1 0 0 0 0
-1 1 0 0 -1 0 0 0 0 0 1
1 0 1 -0.333333 0.333333 0 0 0 0 0 0.666667
-5 0 0 0.333333 -3.33333 0 0 0 0 1 2.33333
Tableau #6
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
1 0 0 -0.333333 0.333333 0 0 0 1 0 0.666667
-1 0 0 0 -1 0 0 1 0 0 1
-7 0 0 0.333333 -5.33333 1 0 0 0 0 8.33333
-1 0 0 0 0 0 1 0 0 0 0
-1 1 0 0 -1 0 0 0 0 0 1
1 0 1 -0.333333 0.333333 0 0 0 0 0 0.666667
-5 0 0 0.333333 -3.33333 0 0 0 0 1 2.33333
Tableau #7
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
1 0 0 -0.333333 0.333333 0 0 0 1 0 0.666667
0 0 0 -0.333333 -0.666667 0 0 1 1 0 1.66667
0 0 0 -2 -3 1 0 0 7 0 13
0 0 0 -0.333333 0.333333 0 1 0 1 0 0.666667
0 1 0 -0.333333 -0.666667 0 0 0 1 0 1.66667
0 0 1 0 0 0 0 0 -1 0 0
0 0 0 -1.33333 -1.66667 0 0 0 5 1 5.66667
Tableau #8
x1 x2 x3 s1 s2 s3 s4 s5 s6 p
1 0 0 0 0 0 -1 0 0 0 0
0 0 0 -1 0 0 2 1 3 0 3
0 0 0 -5 0 1 9 0 16 0 19
0 0 0 -1 1 0 3 0 3 0 2
0 1 0 -1 0 0 2 0 3 0 3
0 0 1 0 0 0 0 0 -1 0 0
0 0 0 -3 0 0 5 0 10 1 9
No optimal solution exists for this problem.

