[Tex/LaTex] hspace, stretch and align

Question

I want to align some equations. One equation has some text that I want pushed back to the margin. I tried

    \begin{align*}
    \text{Text:  } \hspace{\stretch{1}} \text{more text} x^2 &=y\\
    m^2 &= 2\\
    \end{align*}

which gives

                      Text: more textx2 = y 
                                     m2 = 2

but what I want is this:

Text:                       more textx2 = y 
                            m2 = 2

The hspace stretch combination works great on lines that aren't within an align block. I don't want to add a specific size (like hspace{10em}) since I may have to edit the line a bit later, and I do need to keep the pushed text ("Text") on the same line. Any ideas?

Answer 1

We will understand your needs better through a MWE. With amsart your needs will be met like this:

\documentclass{amsart}
%\usepackage{amsmath} % amsart doesn't need this.
\usepackage[showframe]{geometry} % Added to show frames, you may remove this in your file.
% ----------------------------------------------------------------
\begin{document}
% ----------------------------------------------------------------
\begin{flalign*}
\text{Text:} && \text{more text  } x^2 &=y &&  \\
&& m^2 &= 2 &&
\end{flalign*}
% ----------------------------------------------------------------
\end{document}