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x=9-12y
x=-3y
b)3y-1/3x=1
3y-3x=1+1
yx=2
3y-1/3x=1
x=12y-9
3y-1/3*(12y-9)=1
x=12y-9
3y-4y+3=1
x=12y-9
-y=-2 /*(-1)
x=12y-9
y=-4
x=12y-9
y=2
x=15
y=2
Metoda wyznaczników: na mojej stronie: http://www.obliczto.pl/kalkulatory/uklad_rownan/_LICZ_.php?X1=-1&Y1=12&W1=9&X2=-1&Y2=9&W2=3