\documentclass[tikz,border=3mm]{standalone}
\begin{document}
\begin{tikzpicture}
\draw[thick] (0,0) -- (4,1.6) to[out=24,in=265] (7.5,5);
\draw[thick,red] (0.2,-0.2) -- (6.9,2.5) to[out=-90,in=225] (7.5,2.9)
to[out=45,in=135] (8.1,3.16);
\end{tikzpicture}
\end{document}