unit4.tex

\documentclass{ximera}
%% handout
%% nohints
\title{Unit 4 includes a matrix and free response}

\begin{document}

\begin{abstract}
  Matrices and vectors are valid answer types.
\end{abstract}

%\begin{question}
How would you explain why $xy$ is equal to $yx$?
%\begin{solution}
\begin{free-response}
  Think about a rectangle; then rotate it 90 degrees.
\end{free-response}
%\end{solution}
%\end{question}

\begin{exercise}
  Let's think about $\vec{v}$ and a matrix $M$.  Write down any $2
  \times 2$ matrix.

\begin{solution}
  Here is the matrix.

\begin{matrix-answer}[name=M]
  function validator(m) {
    console.log( "validating ", m );
    return m[0][0].v == '17';
  }
\end{matrix-answer}

After the matrix answer.

\end{solution}

\end{exercise}

\end{document}