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f(1/3)=3 A=(1/3 , 3)
f(-2/3)=0 B=(-2/3 , 0)
1/3 a+b=3
-2/3a +b=0 /*(-1)
1/3 a+b=3
2/3 a-b=0
---------------- +
a=3
1/3 *3+b=3
b=3-1
b=2
y=3x+2 równanie prostej