Thread: Vector Gaussian elimination

Hello..
I really need help in Gaussian elimination!!
2x+3y-z=1
x-y+2z=0
3x+2y+z=1

i tried this but its end up with like this:
2x+3y-z=1
-5y+5z=-1
-5y+5z=-1
----------------------------------------------
2x+3y-z=1
0=0

dont know how to figure this out!!
Please help me =)

Originally Posted by sinni8

Hello..
I really need help in Gaussian elimination!!
2x+3y-z=1
x-y+2z=0
3x+2y+z=1

i tried this but its end up with like this:
2x+3y-z=1
-5y+5z=-1
-5y+5z=-1
----------------------------------------------
2x+3y-z=1
0=0

dont know how to figure this out!!
Please help me =)

Since the 3rd equation is the sum of the 1st and the 2nd one you don't get one single point as the common point of the three planes.

All your calculations are OK. The three planes intersect in one straight line. See attachment.