Rozwiąż równanie ; a) x + y = 4x + 2y = 6 .
x+y=4
x+2y=6
-x-y=-4
----------+
y=2
x=2
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x+y=4
x+2y=6
-x-y=-4
x+2y=6
----------+
y=2
x=2
y=2