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B(5;4)
wzór na odl. pu8nków:d=√(5-1)²+(4-8)²=√16+16=√32=4√2
rwnanie prostej AC:y=ax+b
8=a+b
4=5a+b
b=8-a
4=5a+8-a
4a=-4
a=-1
b=8-(-1)=9
y=-x+9
równanie symetralnej:
y=x+9