How to do multiple equation indentation with different offset

Question

How can I reproduce this in latex?

So far I have tried:

\begin{align*}
    &min z(x) = c^Tx\\
    & \text{s.v.} &\\ \begin{split}
         & Ax \geq b \\
        & x \geq 0
    \end{split}
\end{align*}

but I can't get the secondo offset (after text) to force the following equation to align. Any suggestion on how to align at different offset like here?

Answer 1

You might want to make an environment out of this.

\documentclass{article}
\usepackage{amsmath}

\newcommand{\subj}{\textit{s.v.}}

\begin{document}

\begin{equation*}
\begin{split}
 &\! \min z(x)=c^Tx \\
 &\subj \\
 &\qquad\begin{aligned}
   Ax &\ge b \\
   x  &\ge 0
  \end{aligned}
\end{split}
\end{equation*}

\end{document}

Answer 2

Here are two possible solutions. The first, which employs a single align* environment, aligns the = symbol in row 1 with the \geq symbols in rows 3 and 4. The second solution, which does not perform such a "global" alignment and instead performs pairwise alignments, employs two separate aligned environments inside a gather* environment.

\documentclass{article} 
\usepackage{amsmath} % for 'gather*' and 'aligned' environments
\begin{document}

\begin{align*}
\min z(x) &= c^T\!x \\
\textit{s.v.}\qquad& \\
Ax &\geq b \\
x  &\geq 0
\end{align*}

\begin{gather*}
\begin{aligned} % perform left-alignment of rows 1 and 2
&\min z(x) = c^T\!x \\
&\,\textit{s.v.}
\end{aligned}\\
\begin{aligned} % align rows 3 and 4 on '\geq' symbols
Ax &\geq b \\
x  &\geq 0
\end{aligned}
\end{gather*}

\end{document}