gaussian elimination: danny chapa

system of equations:
7x+2z=9
x+3y+z=4
2y+4z=5

augmented matrix:
7 0 2 9
1 3 1 4
0 2 4 5

R1/7:
1 0 2/7 9/7
1 3 1 4
0 2 4 5

-1R2+R1:
1 0 2/7 9/7
0 -3 -5/7 -19/7
0 2 4 5

R2/-3:
1 0 2/7 9/7
0 1 5/21 19/21
0 2 4 5

R3-2R2:
1 0 2/7 9/7
0 1 5/21 19/21
0 0 74/21 86/21

(21/74)R3:
1 0 2/7 9/7
0 1 5/21 19/21
0 0 1 43/37

reduced echlon form:
1 0 0 9/7
0 1 0 19/21
0 0 1 43/37

please tell me where i went wrong

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License