tbil-la-E1-1.ptx

<exercise checkit-seed="0001" checkit-slug="E1" checkit-title="Linear systems, vector equations, and augmented matrices">
  <statement>
        <p> Consider the system of equations</p>
              <me>\begin{matrix}
 -3 \, x_{1} &amp;  -  &amp; x_{2} &amp;  +  &amp; 7 \, x_{3} &amp; = &amp; 4 \\
 -3 \, x_{1} &amp;  -  &amp; 5 \, x_{2} &amp;  -  &amp; x_{3} &amp; = &amp; -4 \\
 4 \, x_{1} &amp;  +  &amp; 3 \, x_{2} &amp;  -  &amp; 6 \, x_{3} &amp; = &amp; -2 \\
 -x_{1} &amp;  -  &amp; x_{2} &amp;  +  &amp; x_{3} &amp; = &amp; 0 \\
 \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}
-3 &amp; -1 &amp; 7 &amp; 4 \\
-3 &amp; -5 &amp; -1 &amp; -4 \\
4 &amp; 3 &amp; -6 &amp; -2 \\
-1 &amp; -1 &amp; 1 &amp; 0
\end{array}\right]</me></li>
                <li><me>x_{1} \left[\begin{array}{c}
-3 \\
-3 \\
4 \\
-1
\end{array}\right] + x_{2} \left[\begin{array}{c}
-1 \\
-5 \\
3 \\
-1
\end{array}\right] + x_{3} \left[\begin{array}{c}
7 \\
-1 \\
-6 \\
1
\end{array}\right] = \left[\begin{array}{c}
4 \\
-4 \\
-2 \\
0
\end{array}\right]</me></li>
      </ol>
    </answer>
</exercise>