# I'm trying to write the Dictionary - Simplex Method - as in the image. Could someone help me? I am trying to write something like that (as shown in the image) but I don't know how...

# I'm using this notation:

\begin{equation}
\begin{array}{rrc1c1}
\multicolumn{4}{1}{} \
& s_1 = 6- 2x_1 - 3x_2 \
& s_2 = 3 + 3x_1 - 2x_2 \
& s_3 = 5 + 0x_1 - 2x_2\
& s_4 = 4 - 2x_1 - 1x_2 \
& Z = 0 - 3x_1 - 4x_2 \
\end{array}
\end{equation}

However, I don't know how to draw a line as in a fraction.
Thank you!

## 1 Answer

There are potential complications. For one, the equation is bottom aligned, in its current presentation, so the eq number will appear to the right of the Z= row (to avoid this, wrap the \tabbedShortstack inside a \vcenter{\hbox{...}}).

Inter-row gap can be increased with \setstackgap{S}{<gap size>}.

But without knowing all your use cases, this might work.

\documentclass{article}
\usepackage[TABcline]{tabstackengine}
\TABstackMath
\TABbinary
\begin{document}
\begin{equation}
\tabbedShortstack[r]{
s_1 =& 6 &- 2x_1 &- 3x_2 \\
s_2 =& 3 &+ 3x_1 &- 2x_2 \\
s_3 =& 5 &+ 0x_1 &- 2x_2\\
s_4 =& 4 &- 2x_1 &- 1x_2 \\
\TABcline{1-4}
Z =& 0 &- 3x_1 &- 4x_2
}
\end{equation}
\end{document} Here it is again, with eq number centered, and increased row and column gaps:

\documentclass{article}
\usepackage[TABcline]{tabstackengine}
\TABstackMath
\TABbinary
\setstackgap{S}{5pt}
\setstacktabbedgap{1ex}
\begin{document}
\begin{equation}
\vcenter{\hbox{\tabbedShortstack[r]{
s_1 =& 6 &- 2x_1 &- 3x_2 \\
s_2 =& 3 &+ 3x_1 &- 2x_2 \\
s_3 =& 5 &+ 0x_1 &- 2x_2\\
s_4 =& 4 &- 2x_1 &- 1x_2 \\
\TABcline{1-4}
Z =& 0 &- 3x_1 &- 4x_2
}}}
\end{equation}
\end{document} • The first one didn't work, I'll try the second one. Thanks – Jo Olive Sep 18 '18 at 20:00
• @Rubs You will have to explain what you mean by "did not work". – Steven B. Segletes Sep 18 '18 at 20:01
• Both are giving me the same output: no line and before the Z letter appears "1 - 4" – Jo Olive Sep 18 '18 at 20:06
• @Rubs Did you invoke the package with \usepackage[TABcline]{tabstackengine}? Do you have an up to date version tabstackengine 2018/03/05 (V2.10)? ctan.org/pkg/tabstackengine and, if needed ctan.org/pkg/stackengine (V4.01) – Steven B. Segletes Sep 18 '18 at 20:07
• Yes, I did invoke it. Well I'm using overleaf... – Jo Olive Sep 18 '18 at 20:11