Rozwiąż :
1) y=2x+z
x+y+z=5
y-z=2
2) x-y-z=2
x+y-z=4
x+y+z=6
3)x=2y
y=2z
x+y+z=7
y=2x+z
y=2+z
2+z=2x+z
z-z+2=2x
2=2x I:2
1=x
x=1
1+y+z=5
1+2+z+z=5
2z=5-3
2z=2 I:2
z=1
y=2+1
y=3
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y=2x+z
x+y+z=5
y-z=2
y=2x+z
x+y+z=5
y=2+z
2+z=2x+z
x+y+z=5
z-z+2=2x
x+y+z=5
2=2x I:2
x+y+z=5
1=x
x+y+z=5
x=1
1+y+z=5
1+y+z=5
y=2+z
1+2+z+z=5
y=2+z
2z=5-3
y=2+z
2z=2 I:2
y=2+z
z=1
y=2+1
z=1
y=3