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{1/2x-1=1/4y | mnożymy razy 4
{-x+y=-2
{2x - y = 4
dodajemy pionowo
x= 2
2x - y = 4
2*2 - y = 4
4-y = 4
y = 4-4
y=0
1/2x-1=1/4y /*4
x-y=2
2x-4=y
x-y=2 /*(-1)
2x-y=4
-x+y=-2
2x-y=4
x=2
2-y=2
y=0