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@@ -0,0 +1,45 @@
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+\documentclass[varwidth=true, border=2pt]{standalone}
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+
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+\usepackage{tkz-fct}
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+\usetikzlibrary{arrows, decorations.pathreplacing}
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+
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+\begin{document}
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+\begin{tikzpicture}
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+ \tkzInit [xmin=0,xmax=7.8,ymin=0,ymax=9.5]
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+ \begin{scriptsize}
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+ \tkzGrid[color = gray!30!white]
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+ \tkzAxeXY
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+ \end{scriptsize}
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+ \draw[thick,green] (0,3.6) -- (8,6.5);
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+ \node[green,rotate=20] at (6.5,6.15) {$\scriptstyle g(x) = m \cdot x + t$};
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+
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+ \draw[dashed,red] (5.5,1) -- (2.5,9);
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+
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+ \draw[thick,fill=red,red] (5.5,1) circle (2pt);
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+ \node[red] at (5.6,1.25) {$P$};
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+
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+ \draw[thick,fill=red,red] (2.5,9) circle (2pt);
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+ \node[red] at (2.8,9) {$P'$};
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+
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+ \draw[dashed] (2.5,5.05) -- (5.6,5.05);
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+
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+ \draw [decorate,decoration={brace,amplitude=10pt,mirror,raise=4pt},yshift=0pt]
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+ (5.5,1) -- (5.5,5.05) node [black,midway,xshift=0.8cm] {\footnotesize
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+ $\Delta y$};
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+
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+ \draw [decorate,decoration={brace,amplitude=10pt,mirror,raise=4pt},yshift=0pt]
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+ (2.5,9) -- (2.5,5.05) node [black,midway,xshift=-0.8cm] {\footnotesize
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+ $\Delta y$};
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+
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+ \draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt},yshift=0pt]
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+ (2.5,5.05) -- (3.97,5.05) node [black,midway,yshift=-0.4cm] {\footnotesize
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+ $\Delta x$};
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+
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+ \draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt},yshift=0pt]
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+ (3.97,5.05) -- (5.5,5.05) node [black,midway,yshift=-0.4cm] {\footnotesize
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+ $\Delta x$};
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+
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+ \draw[thick,fill=red,red] (3.97,5.05) circle (2pt);
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+ \node[red] at (4.1,5.4) {$L$};
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+\end{tikzpicture}
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+\end{document}
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