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-5y+10y=-10
{x=y+3
5y=-10 /:5
{x=y+3
y=-2
{x=-2+3
y=-2
{x=1
y=-2
oznaczony
c){6x+y=3
3x+1/2y=5
{y=3-6x
3x+1,5-3x=5
{y=3-6x
1,5=5
sprzeczny
d){x-2y=-4
0,5x-y=2
{x=-4+2y
0,5(-4+2y)-y=2
{x=-4+2
-2+y-y=2
sprzeczny