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4y-y=4
3y=4 I/3
y=0,75
y=0,75
3x+4y=0+6
y=0,75
3x+4*0,75=6
y=0,75
3x=6-3
y=0,75
3x=3
y=0,75
x=1
-3x-y+2=0 /+3x-2*-1
y=-3/4x+3/2
y=-3x+2
to metoda graficzna