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y=2x+6 (proste rownolegle maja rowne wspol. katowe)
-3=2*2+b
-3=4+b
-3-4=b
b= -7
y=2x-7 rownanie prostej rownoleglej
y= -1/2x+b (iloczyn wspol.kier. prostych prost = -1 ; 2a=-1 ; a=-1/2)
y=-1/2x+b B(-4;2)
2= -1/2*(-4)+b
2= 2+b
2-2=b
b=0
y= -1/2x