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x+2y=6
3x+6y=12 /:(-3)
x+2y=6
-x-2y=-4
------------ +
0 =2
uklad sprzeczny
b)
-3x+4y=2
6x+8y=-4 /:2
-3x+4y=2
3x+4y=-2
-------------- +
8y=0
y=0
3x=-2
x=-2/3
c)
2x-3y=5
-4x+6y=10 /:2
2x-3y=5
-2x+3y=5
------------ +
0=0 tozsamosc
uklad nieoznaczony