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enter image description hereI'm trying to generate this file but I'm getting an error that pdflatex-halt-on-error-inter... I added the package \usepackage{graphicx}, but its not working, any idea?

\documentclass[12pt]{article}
\usepackage{amsmath,amsthm, amssymb, latexsym}
\usepackage{tikz}
\makeatletter
\renewcommand*\env@matrix[1][c]{\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{*\c@MaxMatrixCols #1}}
\makeatother 
\usepackage{moodle}
\usetikzlibrary{external} % set this 
\tikzexternalize          % explicitly
\usepackage{graphicx}
 
\begin{document}
\begin{quiz}{Revisiting Linear Algebra}
\begin{multi}[points=2]{Matrix Form of a Linear System}
Consider the following system
       
\begin{tikzpicture} % matrix inside of tikzpicture node
\node{
$\begin{matrix}[r]
3.0 x_1    &+2.0 x_2     &+2.0  x_3      & -5.0 x_4 & =8 .0   \\
0.6 x_1   &+ 1.5 x_2     &+1.5 x_3       & -5.4 x_4 & =2.7 \\  
1.2 x_1   & -0.3 x_2      & -0.3 x_3      & 2.4 x_4   &  =2.1 , \\  
\end{matrix}
$};
\end{tikzpicture}

which may be written as a single vector equation; i.e, $\mathbf{AB}=\mathbf{B}$.\\
The $\mathbf{A}$ matrix associated with the system is:
\item*
\begin{tikzpicture}
\node{ $
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0   \\
0.6    &+ 1.5      &+1.5        & -5.4   \\  
1.2    & -0.3      & -0.3      & 2.4 , \\  
\end{bmatrix}
$};\end{tikzpicture}
\item\begin{tikzpicture}
\node{ $
\begin{bmatrix}[r]
8 .0   \\
2.7 \\  
2.1  \\  
\end{bmatrix}
$};\end{tikzpicture}  
  \item \begin{tikzpicture}
\node{$
\begin{bmatrix}[r]
x_1 &\\
x_2& \\  
x_3 &\\  
x_4 &\\
\end{bmatrix}
$};\end{tikzpicture}       
\item  
\begin{tikzpicture}
\node{$
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0 &  8.0 \\
0.6    &+ 1.5     &+1.5       & -5.4  & 2.7 \\  
1.2    & -0.3      & -0.3       & 2.4 , & 2.1\\  
\end{bmatrix}
$};
\end{tikzpicture}       
\end{multi}
 \end{quiz}
\end{document}
8
  • 1
    tikz loads graphicx already, so \usepackage{graphicx} is actually redundant. Sep 21 '20 at 15:38
  • he needs shell to be enabled, so what dose that mean ?
    – Diana
    Sep 21 '20 at 15:39
  • This is "pdflatex-shel-escape", this is part of the error
    – Diana
    Sep 21 '20 at 15:41
  • -shell-escape is an option to the pdflatex program allowing it to call other programs. How you enable that depends on which editor you're using. That said, why do you have the matrices in nodes in tikzpictures in the first place? Sep 21 '20 at 15:50
  • I'm using TexMaker, this is a program that I received via this StackExchange, and I'm trying to run it.
    – Diana
    Sep 21 '20 at 15:51

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