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July 6th, 2017, 10:14 AM   #1
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Confused about when to Pivot in a Tableau Table

I'm a bit confused about when to pivot in a tableau table using the simplex method. Here is the problem:

Pivot about the indicated 2 of the following initial simplex tableau

x1 x2 x3 s1 s2 s3 z
2 1 1 1 0 0 0 150
1 2 8 0 1 0 0 200
2 3 1 0 0 1 0 320
_______________________________
-3 -2 -1 0 0 0 1 0

In my textbook it states "to change the tableau by using one of the nonzero entries of the tableau as a pivot." So in that case why are they pivoting on the 2 in the first column, first row for x1? Wouldn't the nonzero entries be s1, s2 and s3 since they are basic variables?
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