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There are three equations to be edited, where each of them need an equation label. Besides, the latter two ones need to gathered by a left bracket {. The final result is like this:

enter image description here

zelphone
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1 Answers1

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Use the cases (or dcases) environment within the align environment. You'll need both amsmath and mathtools packages. Like below:

\begin{align}
    \textrm{max } A & \\
    \textrm{s.t.} &
    \begin{dcases}
        B = C \\
        E = F
    \end{dcases}
\end{align}

This will give you equation numbers like (1) and (2). Not sure how to get (1.1) and (1.2). Check this for more info: https://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics

Shiva
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    It is better to use \max instead of \mathrm{max }, and \textnormal instead of \textrm (or just \text if you want it to match the surrounding text). You can use \numberwithin{equation}{section} to produce the desired numbering format. – Circumscribe Mar 29 '18 at 08:13