\documentclass{standalone}
\usepackage{tikz}
\begin{document}
	\begin{tikzpicture}
	\draw (-1,3) node[left]{$y_1$}-- (-1,1) node[left]{$x_3'$}--(0,0)node[below]{$x_2'$}--cycle;
	\draw [fill=blue!10, opacity=0.8,dashed] (1,1) --(1,3) --(0,4) node[above]{$y_2$}--cycle;
	\draw [fill=blue!10, opacity=0.8] (0,0) -- (1,1) node[right]{$x_1'$} --(1,3) node[right]{$y_3$}--cycle;
	\draw (0,4)--(-1,3)--(1,3);
	\draw [dashed] (0,4)--(-1,1)--(1,1);
	\draw (0,4)--(1,3);
	
	\draw (4,3)-- (4,1)--(3,0)node[below]{$x_2'$}--cycle;
	\draw [fill=blue!10, opacity=0.8,dashed] (2,1)  node[left]{$x_1'$} --(2,3)  node[left]{$y_3$}--(3,4) node[above]{$y_2$}--cycle;
	\draw [fill=blue!10, opacity=0.8] (3,0) -- (2,1) --(2,3)--cycle;
	\draw (3,4)--(2,3)--(4,3) node[right]{$x_1$};
	\draw [dashed] (3,4)--(4,1) node[right]{$y_3'$}--(2,1);
	\draw (3,4)--(4,3);
	\end{tikzpicture}
\end{document}