On Fri, Mar 29, 2019 at 10:20:54AM +0100, Daniel wrote:
> Is it possible to set an optional argument, e.g. [t] for aligned? For
> example, so that the equation aligns at the top with the equation number in
> the attachment.

Yes, it is possible as follows.

1. Copy the content of the math inset (not the inset itself) and
   paste it outside of any math inset.
2. Now add [t] at the proper place.
3. Select all the formula (which now should appear as
   \begin{aligned}[t]y & =x\cdot x\\ & =x^{2}\end{aligned})
   and hit Ctrl+M or paste it in a math inset.

See attached for the end result.

-- 
Enrico
#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 544
\begin_document
\begin_header
\save_transient_properties true
\origin unavailable
\textclass article
\use_default_options true
\maintain_unincluded_children false
\language english
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\font_roman "default" "default"
\font_sans "default" "default"
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\font_math "auto" "auto"
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\font_sf_scale 100 100
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\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\use_minted 0
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\is_math_indent 0
\math_numbering_side default
\quotes_style english
\dynamic_quotes 0
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Enumerate

\family roman
\series medium
\shape up
\size normal
\emph off
\bar no
\strikeout off
\xout off
\uuline off
\uwave off
\noun off
\color none
\begin_inset Formula $\begin{aligned}[t]y & =x\cdot x\\
 & =x^{2}
\end{aligned}
$
\end_inset


\end_layout

\end_body
\end_document

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