SOLUTION: im sapose to use aux matrix and let z be a x+2y+2z=13 -2x+y+z=-1 -x+2y-z=-8

Algebra ->  Matrices-and-determiminant -> SOLUTION: im sapose to use aux matrix and let z be a x+2y+2z=13 -2x+y+z=-1 -x+2y-z=-8      Log On


   

Question 862218: im sapose to use aux matrix and let z be a
x+2y+2z=13
-2x+y+z=-1
-x+2y-z=-8
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x+2y+2z=13
-2x+y+z=-1
-x+2y-z=-8
Add (2 * row1) to row2
1 2 2 13
0 5 5 25
-1 2 -1 8
Add (1 * row1) to row3
1 2 2 13
0 5 5 25
0 4 1 21
Divide row2 by 5
1 2 2 13
0 1 1 5
0 4 1 21
Add (-4 * row2) to row3
1 2 2 13
0 1 1 5
0 0 -3 1
Divide row3 by -3
1 2 2 13
0 1 1 5
0 0 1 -1/3
Add (-1 * row3) to row2
1 2 2 13
0 1 0 16/3
0 0 1 -1/3
Add (-2 * row3) to row1
1 2 0 41/3
0 1 0 16/3
0 0 1 -1/3
Add (-2 * row2) to row1
1 0 0 3
0 1 0 16/3
0 0 1 -1/3