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

solve using the gauss-jordan method.

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 10:09pm
http://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
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx

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

## Answer This Question

## Related Questions

- Algebra - Use the Gauss-Jordan method to invert 1 0 0 2 -1 0 0 0 1 A1= 1 1 1 A2...
- trig gauss jordan - Write the augmented matrix, and then solve the system, using...
- Pre-Calculus - Solve for x,y,z, & w using the Gauss-Jordan Elimination Method 5x...
- Finite Math - Discuss the differences between the echelon method and the gauss-...
- algebra - Solve the system of equations by first writing it in matrix form and ...
- Trig sum please help - Write the augmented matrix, and then solve the system, ...
- MATH - solve the system of linear equations using the Gauss- Jordan elimination ...
- Algebra-Multiple choice - Hello, I have some practice math I'm working through ...
- Algebra - How would you solve this matrices using the Gauss-jordan elimination ...
- math - solve by the gauss-jordan method x+y+z=6 3x+2y-z=4 3x+2y+2z=11

More Related Questions