3 in the "z"-column, that is the pivot column.
Since the most negative number in the bottom row is the 3 in the "z"-column, that is the pivot column.
The only candidates for the pivot are the non-zero numbers in the "z"-column: the "1" in the first row and the "4" in the third. To choose between them, select the one whose test ratio is smallest (shown blinking).
| x | y | z | s | t | u | p | Ans | ||
| 7 | 0 | 1 | 0 | 0 | 0 |  | 6 | test ratio = 6/1 = 6 | |
| 1 | 2 | 0 | 0 | 1 | 0 | 0 | | 20 | |
| 0 | 3 | 4 | 0 | 0 | 1 | 0 | | 30 | test ratio = 30/4 = 7.5 |
| 1 | 2 | 3 | 0 | 0 | 0 | 1 | | 0 | |
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