<exercise>
<statement>
<p>Show how to find the solution set for the following
<xsl:choose>
<xsl:when test="prompt='system'">
system of linear equations.
<me><xsl:value-of select="system"/></me>
</xsl:when>
<xsl:otherwise>
vector equation <me><xsl:value-of select="vectoreq"/>.</me>
</xsl:otherwise>
</xsl:choose>
</p>
</statement>
<answer>
<me>\mathrm{RREF}<xsl:value-of select="matrix"/> = <xsl:value-of select="rref"/></me>
<p>The solution set is <m><xsl:value-of select="solution"/></m>.</p>
</answer>
</exercise>