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2x-2y-z-3=0 2x-2y+z-5=0 2x+2y-z+1=0 2x+2y+z-1=0
2x+y-z=0 2x-y十z-0 x-y-z=0 2x-y-z=0
（x-1）／1=（y-1）／1=（z-1）／-1 （x-1）／1=（y-1）／1=（z-1）／-2 （x-1）／1=（y-1）／-1=（z-1）／-2 x+y-z=1
x=y=(3−z)/2 x-1=y-1=(z−1)/2 x-1=(y−1)/−1 =(z−1)/ −2 x-1=y-1=(z−1)/−1
x+2y+3z-6=0 x+2y+3z+6=0 2x-y-3=0 x-2y+3z-6=0
2x-2y-z-3=0 2x-2y+z-5=0 2x+2y-z+1=0 2x+2y+z-1=0
2x+4y+z=11 -2x-4y+z=-1 2x-4y-z=-15 2x-4y+z=-5
2x+y-z=0 2x-y+z=0 x-y-z=0 2x-y-z=0
x+y+z=0 x+y+z=1 x+y+z=2 x+y+z=3
x-y+z=-2 x+y+z=2 x-2y+z=-3 x-y-z=0
(A) (B) L∥∏． (C) L⊥∏． (D) L与∏斜交．
2x+4y+z=11 -2x-4y+z=-1 2x-4y-z=-15 2x-4y+z=-5
2x-2y-z-3=0 2x-2y+z-5=0 2x+2y-z+1=0 2x+2y+z-1=0
-2x-4y+z=-1 2x-4y-z=-15 2x+4y+z=11 2x-4y+z=-5
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