enter image description here

I have the need to draw this project on Tikz, I have some doubts and I can not begin.

closed as off-topic by Raaja, user156344, Dox, Kurt, Sebastiano Apr 2 at 15:05

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\begin{tikzpicture}[bbt/.style={draw=blue,solid,thick,fill=blue!50,circle,inner sep=2pt}]
 \draw (-0.5,0) -- (5,0) (0,-0.5) -- (0,5);
 \draw[dotted] (0,1) node[left]{$y_1$} -- (1,1) node[bbt,label=above:$A$] (A){} -- (1,0)
 \draw[dotted] (0,4) node[left]{$y_2$} -- (4,4) node[bbt,label=above:$B$] (B){}  {} -- (4,0)
 \draw[purple] (A) -- (B) node[midway,above,sloped] {$d_{A,B}$};

enter image description here

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