<exercise>
<statement>
<p>Consider the following statement.</p>
<ul><li> The set of vectors <m><xsl:value-of select="vecset"/></m>
<xsl:choose>
<xsl:when test="prompt">spans </xsl:when>
<xsl:otherwise>does not span </xsl:otherwise>
</xsl:choose>
<m>\mathbb{R}^4</m>.
</li></ul>
<ol>
<li> Write an equivalent statement using a vector equation.</li>
<li> Explain why your statement is true or false.</li>
</ol>
</statement>
<answer>
<p><me>\operatorname{RREF}<xsl:value-of select="matrix"/>=<xsl:value-of select="rref"/></me></p>
<ol>
<li>The vector equation <m><xsl:value-of select="vecComb"/>=\vec{v}</m>
<xsl:choose>
<xsl:when test="prompt"> has a solution for every </xsl:when>
<xsl:otherwise> is inconsistent for some </xsl:otherwise>
</xsl:choose>
vector <m>\vec{v}</m> in <m>\mathbb{R}^4</m>.
</li>
<li>
The set of vectors <m><xsl:value-of select="vecset"/></m>
<xsl:choose>
<xsl:when test="spans"> spans </xsl:when>
<xsl:otherwise> does not span </xsl:otherwise>
</xsl:choose>
<m>\mathbb{R}^4</m>.
</li>
</ol>
</answer>
</exercise>
