Rozwiąż układ trzech równań z trzema niewiadomymi:
x +y−z =4
x -2 y + 3 z = -6
2 x+ 3 y+z = 7
x=4+z-y
x=2y-3z-6
x=3,5-1,5y-0,5z
4+z-y=2y-3z-6
2y-3z-6=3,5-1,5y-0,5z
4z+10=3y
3,5y=2,5z+9,5
7y=5z+19
5z+12,5=3,75y
7y-5z=19
-----------
3,25y=6,5
y=2
4z=10=6
z=-1
x=1
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x +y−z =4
x -2 y + 3 z = -6
2 x+ 3 y+z = 7
x=4+z-y
x=2y-3z-6
x=3,5-1,5y-0,5z
4+z-y=2y-3z-6
2y-3z-6=3,5-1,5y-0,5z
4z+10=3y
3,5y=2,5z+9,5
4z+10=3y
7y=5z+19
5z+12,5=3,75y
7y-5z=19
-----------
3,25y=6,5
y=2
y=2
4z=10=6
y=2
z=-1
x=1