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Posted by **Veronica** on Wednesday, February 29, 2012 at 9:55pm.

x-2y+4z=7

-x+3y-z=-1

2x+y=-2

*I get through the first two columbs, but can't get the third one to the one and zero.

- math-matrix -
**Damon**, Wednesday, February 29, 2012 at 10:09pmhttp://www.irs.gov/pub/irs-pdf/i1040tt.pdf

Step 2: Enter the values for your matrix, and press the "Solve" button.

three rows, four columns

Input

+1 -2 +4 +7

-1 +3 -1 -1

+2 +1 +0 -2

Add (1 * row1) to row2

1 -2 4 7

0 1 3 6

2 1 0 -2

Add (-2 * row1) to row3

1 -2 4 7

0 1 3 6

0 5 -8 -16

Add (-5 * row2) to row3

1 -2 4 7

0 1 3 6

0 0 -23 -46

Divide row3 by -23

1 -2 4 7

0 1 3 6

0 0 1 2

Add (-3 * row3) to row2

1 -2 4 7

0 1 0 0

0 0 1 2

Add (-4 * row3) to row1

1 -2 0 -1

0 1 0 0

0 0 1 2

Add (2 * row2) to row1

1 0 0 -1

0 1 0 0

0 0 1 2

- link correction -
**Damon**, Wednesday, February 29, 2012 at 10:11pm - math-matrix -
**Veronica**, Wednesday, February 29, 2012 at 10:18pmthanks, wasn't too sure whether I could divide by -23 or not. Found the website, was really helpfull =)

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