\definecolor{qqqqff}{rgb}{0,0,1}
\definecolor{qqwuqq}{rgb}{0,0.39215686274509803,0}
\begin{tikzpicture}[line cap=round,line join=round,x=1cm,y=1cm]
\begin{axis}[
x=1cm,y=1cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-5,
xmax=12,
ymin=-3,
ymax=12,
xtick={-4,-2,...,11},
ytick={-2,...,11},]
\clip(-5.974,-6.134) rectangle (27.73,14.964);
\draw[line width=2pt,color=qqwuqq,smooth,samples=100,domain=-5.974000000000008:27.729999999999997] plot(\x,{0-(\x)+9});
\draw [line width=2pt,domain=-5.974:27.73] plot(\x,{(--2-0*\x)/1});
\draw[line width=2pt,color=qqqqff,smooth,samples=100,domain=-5.974000000000008:27.729999999999997] plot(\x,{2*(\x)+6});
\begin{scriptsize}
\draw[color=qqwuqq] (-5.688,14.689) node {$g$};
\draw[color=black] (-5.71,2.435) node {$f$};
\draw[color=qqqqff] (-5.688,-5.287) node {$h$};
\end{scriptsize}
\end{axis}
\end{tikzpicture}