How to create a new counter of equation.
The new equation is matriz and use other sequence number.

```
\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}

\begin{document}

\begin{equation}
 y = x
\end{equation}

\begin{equation}
 y = \frac{1}{x}
\end{equation}

The of next matriz equation is 1.

\begin{matriz}
y = \sqrt x
\end{matriz}

\end{document}

```

I need,
equation 1
equation 2
matriz 1
matriz 2
equation 3
matriz 3
matriz 4

New counter of matriz.