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-y=-3x-1 /*(-1)
y=3x+1
a=3
a1=-1/a warunek prostopadlości
y=-1/3 x+b
-1/3 *(-5)+b =6
5/3 +b=6
b=6 -1 2/3
b=4 1/3
y=-1/3 x+4 1/3 prosta prostopadla do zadanej , zawiera A