How to align two side by side equations at the top?

Question

\begin{equation*}
\begin{array}{ll@{}ll}
\text{minimize}  & \|Ax-b\|_\infty &\\
\end{array}
\quad 
\begin{array}{ll@{}ll}
\text{minimize}  & t &\\
\text{subject to} & Ax-b \preceq t \mathbf{1} & \\
& -(Ax-b) \preceq t \mathbf{1}& \\
\end{array}
\end{equation*}

Generates

But it would be better if the two minimize lines would align...

Can anyone help me to align the two equations side by side at "minimize"

Answer 1

You can obtain it with [t] option to array environment.

\begin{equation*}
\begin{array}[t]{ll@{}ll}
\text{minimize}  & \|Ax-b\|_\infty &\\
\end{array}
\quad 
\begin{array}[t]{ll@{}ll}
\text{minimize}  & t &\\
\text{subject to} & Ax-b \preceq t \mathbf{1} & \\
& -(Ax-b) \preceq t \mathbf{1}& \\
\end{array}
\end{equation*}