rozwiąż układ rownan: 9x+11y=20
2x-3y=-1
9x+11y=202x-3y=-1/:2
x-3/2=-1/2x=19*1 + 11y=2-9+11y=20
11y=11/:11
y=1
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9x+11y=20
2x-3y=-1/:2
x-3/2=-1/2
x=1
9*1 + 11y=2-
9+11y=20
11y=11/:11
y=1