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x-2y+z=0 2x-y-z=0 x+2y-z=2 2x+y-z=2
2x+y-z=0 2x-y十z-0 x-y-z=0 2x-y-z=0
3x+2y+7z=0 3x-2y+7z=0 3x-2y-7z=0 x-2y+7z=0
2x+y-z=0 2x-y十z-0 x-y-z=0 2x-y-z=0
x2+y2=4z x2-y2=2z x2-y2=z x2-y2=4z
(2,0,0) (0,0,-1) (3,-1,0) (0,1,1)
2x+y-z=0 2x-y+z=0 x-y-z=0 2x-y-z=0
2x+y-z=0 2x-y+z=0 x-y-z=0 2x-y-z=O
3x+2y+7z=0 3x-2y+7z=0 3x-2y-7z=0 x-2y+7z=0
3x+2y+7z=0 3x-2y+7z=0 3x-2y-7z=0 x-2y+7z=0
2x+8y+z+8=0 2x-8y+z+8=0 2x+8y-z+8=0 2x+8y+z-8=0