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2x-y=7 /*2
3x+2y=7
4x - 2y = 14
3x + 2y = 7
(+)------------------
7x = 21
x = 3
x=3
2*3-y=7
x=3
6-y=7
x=3
y= -1
Zadanie 2
6x+y=3 /*(-2)
12x+2y=6
-12x-2y=-6
12x+2y=6
(+)---------------
0=0
nieoznaczony - nieskonczenie wiele rozwiazan