\documentclass{book}

\usepackage{amsmath}
\usepackage{amsthm}

\usepackage{xepersian}



\settextfont[Scale=1]{Yas}
\setlatintextfont[Scale=1]{Yas}
\setdigitfont[Scale=1]{PGaramond}

\begin{document}

\begin{align}
& a+b+c =1\nonumber\\
& c+d+f =2\\
& g+h+i =3\nonumber
\end{align}
















\end{document}
\begin{figure}[!h]
\centerline{\includegraphics[height=10cm]{pic/pic.jpg}}
\label{fig}\caption{}
\end{figure}