<exercise>
<statement>
<p>Consider the subspace <me>W=\operatorname{span} <xsl:value-of select="vlist"/>.</me>
</p>
<ol>
<li> Explain how to find a basis of <m>W</m>.</li>
<li> Explain how to find the dimension of <m>W</m>.</li>
</ol>
</statement>
<answer>
<p><me>\operatorname{RREF}<xsl:value-of select="matrix"/>=<xsl:value-of select="rref"/></me></p>
<ol>
<li>A basis of <m>W</m> is <m><xsl:value-of select="basis"/></m>.</li>
<li>The dimension of <m>W</m> is <m><xsl:value-of select="dimension"/></m>.</li>
</ol>
</answer>
</exercise>