x-y=0
x+y+z=4
x+2y+3z=9
to jest równanie z trzema niewiadomymi
powinna być jeszcze z boku klamra
x=y
y+y+z=4
y+2y+3z=9
2y+z=4
3y+3z=9
z=4-2y
3y+3(4-2y)=9
3y+12-6y=9
-3y=-3 / : (-3)
y=1
x=1
z=4-2*1
z= 2
z=2
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x=y
y+y+z=4
y+2y+3z=9
x=y
2y+z=4
3y+3z=9
x=y
z=4-2y
3y+3z=9
x=y
z=4-2y
3y+3(4-2y)=9
x=y
z=4-2y
3y+12-6y=9
x=y
z=4-2y
-3y=-3 / : (-3)
x=y
z=4-2y
y=1
x=1
z=4-2*1
y=1
x=1
z= 2
y=1
x=1
y=1
z=2