---LINEAR TRI-SYSTEM---
Please explain how to do this problem because I already have the answer as (0,4,-2)
5x+y-z=6
x+y+z=2
3x+y=4
add the first two equations:
6x+2y=8 or
3x+y=4
then subtract the third equation to get
0=0 which means there is no unique solution.
for instance (2,-2, 2) is also a solution.