0001.ptx

<exercise checkit-seed="0001" checkit-slug="A2" checkit-title="Standard matrices">
  <statement>
    <ol>
      <li>Find the standard matrix for the linear transformation <m>S:\mathbb{R}^ 3  \to \mathbb{R}^ 4 </m> given by
              <me>S\left(  \left[\begin{array}{c}
x \\
y \\
z
\end{array}\right]  \right) =  \left[\begin{array}{c}
-x + 3 \, y + 4 \, z \\
-x - z \\
2 \, x - 2 \, y - z \\
-3 \, x + y - 6 \, z
\end{array}\right] .</me></li>
      <li>Let <m>T:\mathbb{R}^ 4  \to \mathbb{R}^ 2 </m> be the linear transformation given by the standard matrix
              <me> \left[\begin{array}{cccc}
2 &amp; 6 &amp; 1 &amp; -3 \\
1 &amp; 3 &amp; 1 &amp; -2
\end{array}\right] .</me>
              Compute <m>T\left( \left[\begin{array}{c}
-3 \\
-7 \\
6 \\
-5
\end{array}\right]  \right)</m>.
          </li>
    </ol>
  </statement>
  <answer>
    <ol>
      <li>
        <me> \left[\begin{array}{ccc}
-1 &amp; 3 &amp; 4 \\
-1 &amp; 0 &amp; -1 \\
2 &amp; -2 &amp; -1 \\
-3 &amp; 1 &amp; -6
\end{array}\right] </me>
      </li>
      <li>
        <me>T\left( \left[\begin{array}{c}
-3 \\
-7 \\
6 \\
-5
\end{array}\right]  \right)= \left[\begin{array}{c}
-27 \\
-8
\end{array}\right] </me>
      </li>
    </ol>
  </answer>
</exercise>