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please i need help, i have a problem with i-2
i work on this: http://texwelt.de/wissen/fragen/4912/skizze-zur-illustration-linearer-regression
and i'm trying to do something like this
\documentclass[12pt,oneside,fleqn]{book}
\usepackage{tikz}
\usetikzlibrary{arrows,intersections}
\tikzpictu...