0009.ptx

<exercise checkit-seed="0009" checkit-slug="E1" checkit-title="Linear systems, vector equations, and augmented matrices">
  <statement>
    <p> Consider the system of equations</p>
    <me>\begin{matrix}
 x_{1} &amp;  &amp;  &amp;  +  &amp; 3 \, x_{3} &amp; = &amp; -4 \\
 &amp;  &amp; x_{2} &amp;  +  &amp; 3 \, x_{3} &amp; = &amp; -5 \\
 x_{1} &amp;  &amp;  &amp;  +  &amp; 4 \, x_{3} &amp; = &amp; -6 \\
 3 \, x_{1} &amp;  -  &amp; 2 \, x_{2} &amp;  +  &amp; 6 \, x_{3} &amp; = &amp; -8 \\
 \end{matrix}</me>
    <ol>
      <li> Write an augmented matrix corresponding to this system. </li>
      <li> Write a vector equation corresponding to this system. </li>
    </ol>
  </statement>
  <answer>
    <ol>
      <li>
        <me> \left[\begin{array}{ccc|c}
1 &amp; 0 &amp; 3 &amp; -4 \\
0 &amp; 1 &amp; 3 &amp; -5 \\
1 &amp; 0 &amp; 4 &amp; -6 \\
3 &amp; -2 &amp; 6 &amp; -8
\end{array}\right] </me>
      </li>
      <li>
        <me> x_{1} \left[\begin{array}{c}
1 \\
0 \\
1 \\
3
\end{array}\right] + x_{2} \left[\begin{array}{c}
0 \\
1 \\
0 \\
-2
\end{array}\right] + x_{3} \left[\begin{array}{c}
3 \\
3 \\
4 \\
6
\end{array}\right] = \left[\begin{array}{c}
-4 \\
-5 \\
-6 \\
-8
\end{array}\right] </me>
      </li>
    </ol>
  </answer>
</exercise>