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x+y=0
-x-y=-2
x+y=0
___________
0 nie rowna sie -2 brak rozwiazania
b)-x+y=5
x+y=5
_______
2y=10I/2
y=5
x+y=5
x=5-5
x=0 odp.x=0 y =5
c)5x+3y=0
-x-2y=7 I*5
5x+3y=0
-5x-10y=35
__________
-7y=35 I/(-7)
y=-5
-x-2y=7
-x=-3 I(-1)
x=3 odp.x=3 y= -5
d)3x+2y=2 I (-5)
5x+4y=6 I *3
-15x-10y=-10
15x+12y=18
__________
2y=8 I/2
y=4
3x+2y=2
3x=-6 I/3
x= -2
odp.x=-2 y=4