E1-5.ptx

<exercise checkit-seed="0005" checkit-slug="E1" checkit-title="Linear systems, vector equations, and augmented matrices">
  <statement>
        <p> Consider the system of equations</p>
              <me>\begin{matrix}
 -2 \, x_{1} &amp;  +  &amp; 6 \, x_{2} &amp;  -  &amp; 6 \, x_{3} &amp;  -  &amp; 2 \, x_{4} &amp; = &amp; 4 \\
 3 \, x_{1} &amp;  -  &amp; 9 \, x_{2} &amp;  +  &amp; 9 \, x_{3} &amp;  +  &amp; x_{4} &amp; = &amp; 0 \\
 -3 \, x_{1} &amp;  +  &amp; 9 \, x_{2} &amp;  -  &amp; 9 \, x_{3} &amp;  -  &amp; 2 \, x_{4} &amp; = &amp; 3 \\
 \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}{cccc|c}
-2 &amp; 6 &amp; -6 &amp; -2 &amp; 4 \\
3 &amp; -9 &amp; 9 &amp; 1 &amp; 0 \\
-3 &amp; 9 &amp; -9 &amp; -2 &amp; 3
\end{array}\right]</me></li>
                <li><me>x_{1} \left[\begin{array}{c}
-2 \\
3 \\
-3
\end{array}\right] + x_{2} \left[\begin{array}{c}
6 \\
-9 \\
9
\end{array}\right] + x_{3} \left[\begin{array}{c}
-6 \\
9 \\
-9
\end{array}\right] + x_{4} \left[\begin{array}{c}
-2 \\
1 \\
-2
\end{array}\right] = \left[\begin{array}{c}
4 \\
0 \\
3
\end{array}\right]</me></li>
      </ol>
    </answer>
</exercise>