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-4a+b=-2
2a+b=6
----------- _
-6a=-8
a=8/6=4/3
a1*a2=-1
4/3*a=-1
a= -3/4
y=-3/4 x+b
Srodek odcinka AB
S=(a,b)
a=1/2(-4+2)=-1
b=1/2(-2+6)=2
S=(-1,2)
Symetralna przechodzi przez S
-3/4*(-1)+b=2
3/4+b=2
b=5/4
Odp. y= -3/4 x+5/4.