數學 set問題

(x，y，z)=(z+2y，x-z/2，x-2y)

2014-08-26 12:46:43 補充：
-x+2y+z=0

-x=0-z-2y=-z-2y

x=z+2y



-x+2y+z=0

2y=0-z+x=x-z

y=(x-z)/2



-x+2y+z=0

z=0-z+x=x-2y

z=x-2y

It is a plane.

Please see:
http://www.wolframalpha.com/input/?i=-x%2B2y%2Bz%3D0&t=crmtb01