%% 
%%  An UIT Edition example
%% 
%%  Example 06-11-8 on page 107.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{58}
\renewcommand\theequation{6.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{subequations}
\renewcommand{\theequation}{%
  \theparentequation -\arabic{equation}}
\begin{align}
y &= d\\
y &= cx+d\label{eq:subequation}\\
y &= bx^{2}+cx+d\\
y &= ax^{3}+bx^{2}+cx+d
\end{align}
\end{subequations}
A reference to Eq.~\ref{eq:subequation}
on page~\pageref{eq:subequation}.
\end{document}
