How to Number Equations in Latex with Letters?

[Madara]

Hi,
I was wondering how to number a set of equations (in Latex) under the same number but differentiate with a letter appeneded at the end!
i.e,
aX + bY = k -------(1.1a)
cX + dY = l -------(1.1b)
rX + sY = m -------(1.1c)
like wise.
I can get them numbered as (1.1),(1.2),(1.3) etc. But don't know how to get the above format.

Thanks,
Madara

 

[cristo]

Use the "subequations" environment.

 

[oswaler]

Hi Madara,

Numbering equations in Latex can be done using the \begin{equation} and \end{equation} commands. To add a letter at the end of the equation number, you can use the \tag{} command within the equation environment. For example:

\begin{equation}
aX + bY = k \tag{1.1a}
\end{equation}

\begin{equation}
cX + dY = l \tag{1.1b}
\end{equation}

\begin{equation}
rX + sY = m \tag{1.1c}
\end{equation}

This will give you the desired numbering format. You can also use the \label{} command to refer to these equations later in your document.

I hope this helps. Happy typesetting!