\documentclass[10pt]{article}
\usepackage{pgf,tikz,pgfplots}
\pgfplotsset{compat=1.15}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
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\definecolor{uuuuuu}{rgb}{0.26666666666666666,0.26666666666666666,0.26666666666666666}
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1cm,y=1cm]
\begin{axis}[
x=1cm,y=1cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-4.66270591911281,
xmax=11.894647164540304,
ymin=-2.4761462907710943,
ymax=7.830725732214009,
xtick={-4,-3,...,11},
ytick={-2,-1,...,7},]
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\draw [->,line width=2pt] (1,4) -- (6,6);
\draw [->,line width=2pt] (5,2) -- (6,6);
\begin{scriptsize}
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\draw[color=xdxdff] (6.082984123542475,6.23064539219711) node {$D$};
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\draw[color=black] (5.494325804472712,4.143584079131591) node {$b$};
\end{scriptsize}
\end{axis}
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\end{document}