diff --git a/3_equ-tab-figs/1_equations/main.tex b/3_equ-tab-figs/1_equations/main.tex
index 50b8799..4ac346e 100644
--- a/3_equ-tab-figs/1_equations/main.tex
+++ b/3_equ-tab-figs/1_equations/main.tex
@@ -31,6 +31,14 @@ Previous equations are used to define the Fourier series as:
   \label{eq:fourier}
   g(t)=a_0+\sum_{m=1}^{\infty}a_m \cos{\left(\frac{2\pi mt}{T}\right)}++\sum_{m=1}^{\infty}b_n \sin{\left(\frac{2\pi nt}{T}\right)}
 \end{equation}
+
+\begin{equation}
+A=
+\begin{pmatrix}
+a & b& c\\
+d & e &f
+\end{pmatrix}
+\end{equation}
 \end{document}
 
 
diff --git a/3_equ-tab-figs/2_figures/main.tex b/3_equ-tab-figs/2_figures/main.tex
index 51a2f4e..eb49d45 100644
--- a/3_equ-tab-figs/2_figures/main.tex
+++ b/3_equ-tab-figs/2_figures/main.tex
@@ -1,6 +1,12 @@
 \documentclass{article}
 \usepackage{amsmath}
 \usepackage{graphicx}
+\usepackage{caption}
+\usepackage{subcaption}
+%\usepackage{hyperref}
+%\captionsetup{subrefformat=parens}
+% new suref command
+\newcommand{\suref}[2]{\figurename{} \ref{#1}:(\subref{#2})}
 \begin{document}
 \section{Simple figures}
 \label{sec:simple}
@@ -12,4 +18,42 @@ This is a simple figure; see \figurename{} \ref{fig:fig-example}.
   \caption{Figure's caption.}
   \label{fig:fig-example}
 \end{figure}
+
+\section{The subsigures option}
+\label{sec:subfigures}
+Now we are adding three sub-figure in one figure; see \figurename{} \ref{fig:three graphs}. Notice that in \ref{fig:a} ... or by using \suref{fig:three graphs}{fig:a} ... 
+
+%on body
+\begin{figure}
+   \centering
+   \begin{subfigure}[t]{0.3\textwidth}
+       \centering
+       \includegraphics[width=\textwidth]{example-image-a}
+       \caption{The image a}
+       \label{fig:a}
+   \end{subfigure}
+   \hfill
+   \begin{subfigure}[t]{0.3\textwidth}
+       \centering
+       \includegraphics[width=\textwidth]{example-image-b}
+       \caption{The image b}
+       \label{fig:b}
+   \end{subfigure}
+   \hfill
+   \begin{subfigure}[t]{0.3\textwidth}
+       \centering
+       \includegraphics[width=\textwidth]{example-image-c}
+       \caption{The image c with more text than the other captions}
+       \label{fig:c}
+   \end{subfigure}
+      \caption{Three images together and its large caption}
+      \label{fig:three graphs}
+    \end{figure}
+
+\newpage
+
+\section{Tables}
+\label{sec:tables}
+
+
 \end{document}
\ No newline at end of file