tbil-la-E1-4.ptx

<exercise checkit-seed="0004" checkit-slug="E1" checkit-title="Linear systems, vector equations, and augmented matrices">
  <statement>
        <p> Consider the augmented matrix </p>
              <me>\left[\begin{array}{ccc|c}
1 &amp; 0 &amp; 2 &amp; 3 \\
-2 &amp; 1 &amp; -5 &amp; -2 \\
-3 &amp; 1 &amp; -7 &amp; -4 \\
-2 &amp; 1 &amp; -5 &amp; -5
\end{array}\right]</me>
         <ol>
            <li> Write a system of scalar equations corresponding to this augmented matrix. </li>
            <li> Write a vector equation corresponding to this augmented matrix. </li>
        </ol>
  </statement>

  <answer>
     <ol>
                <li><me>\begin{matrix}
 x &amp;  &amp;  &amp;  +  &amp; 2 \, z &amp; = &amp; 3 \\
 -2 \, x &amp;  +  &amp; y &amp;  -  &amp; 5 \, z &amp; = &amp; -2 \\
 -3 \, x &amp;  +  &amp; y &amp;  -  &amp; 7 \, z &amp; = &amp; -4 \\
 -2 \, x &amp;  +  &amp; y &amp;  -  &amp; 5 \, z &amp; = &amp; -5 \\
 \end{matrix}</me></li>
                <li><me>x_{1} \left[\begin{array}{c}
1 \\
-2 \\
-3 \\
-2
\end{array}\right] + x_{2} \left[\begin{array}{c}
0 \\
1 \\
1 \\
1
\end{array}\right] + x_{3} \left[\begin{array}{c}
2 \\
-5 \\
-7 \\
-5
\end{array}\right] = \left[\begin{array}{c}
3 \\
-2 \\
-4 \\
-5
\end{array}\right]</me></li>
      </ol>
    </answer>
</exercise>