请问怎么由2x-3y+z=0 ,3x-2y-6z=0 得到x=3z,y=4z

2x-3y+z=0 (1)
3x-2y-6z=0 (2)
(1)*2-(2)*3
4x-6y+2z-9x+6y+18z=0
-5x+20z=0
5x=20z
x=4z
(1)*3-(2)*2
6x-9y+3z-6x+4y+12z=0
-5y+15z=0
5y=15z
y=3z
你的结论反了