[OS X TeX] Aligning equations with comments

[David Arnold]

I've got something that almost works:

$$ 
\begin{array}{rrrrrp{6cm}}
2x & + & 5y & = & 6 & \textcolor{red}{Now is the time for all good men.}\\
3x & - & 4y & = & 12 & \textcolor{red}{Dark are the days}.\\\cline{1-5}
\end{array}
$$

But when I try to separate the text from the math, my underline extends as well.

$$ 
\begin{array}{rrrrr@{\hspace{1cm}}p{6cm}}
2x & + & 5y & = & 6 & \textcolor{red}{Now is the time for all good men.}\\
3x & - & 4y & = & 12 & \textcolor{red}{Dark are the days}.\\\cline{1-5}
\end{array}
$$

Anyone have a solution where I get get my underline to stop just after the 12?

D.



On Mar 18, 2011, at 1:26 PM, <leedwitt at gmail.com> wrote:

> I need to align x-terms, operator, y-terms, equal sign, and right-hand sides in their own columns, while keeping my comment space to the right. I also need to underline that second equation before writing that third equation.
> ++++++++++++++
> 
> I've used hphantom commands to align x and y values before (one equation has 3x, use hphantom{3}x in the next line. Same thing for negatives to align right sides. 
> 
> I have no idea about the underlining. 
> Sent from my Verizon Wireless BlackBerry
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