To obtain the second tableau, follow Step 5 and pivot on the selected entry (the "1" in Row 1, Column 3), as follows: (for quick instructions on how to pivot, press here).

x	y	z	s	t	u	p		Ans
7	0	1	1	0	0	0		6
1	2	0	0	1	0	0		20
0	3	4	0	0	1	0		30	R3 4R1
1	2	3	0	0	0	1		0	R4 + 3R1

This gives

x	y	z	s	t	u	p		Ans
7	0	1	1	0	0	0		6
1	2	0	0	1	0	0		20
28	3	0	4	0	1	0		6
20	2	0	3	0	0	1		18

Just close this window to return to the tutorial.