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).
|7||0||1||0||0||0||6||test ratio = 6/1 = 6|
|0||3||4||0||0||1||0||30||test ratio = 30/4 = 7.5|
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