prosta o równaniu 2x+my-1=0 jest równoległa do osi y, gdy:
m=0,m=1,m=-1,m=-2
my=-2x+1//m
y=-2x/2+1/m
f(x) || Oy, gdy a=0
-2/m=0, gdy m=0
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my=-2x+1//m
y=-2x/2+1/m
f(x) || Oy, gdy a=0
-2/m=0, gdy m=0