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xs=-4+2/2=-2/2=-1
ys=0+6/2=6/2=3
prosta AB
0=-4a+b /*-1
6=2a+b
4a-b=0
2a+b=6
----------+
6a=6 /:6
a=1
b=6-2=4
y=x-4
równanie symetralnej
y=ax+b
a=-1
3=-1*-1+b
b=3-1
b=2
y=-x+2