E3.ptx

<exercise>
  <statement>
    <p>Show how to find the solution set for the following 
    <xsl:choose>
        <xsl:when test="prompt='system'">
            system of linear equations.
            <md alignment="alignat">
                <xsl:attribute name="alignat-columns"><xsl:value-of select="alignCols"/></xsl:attribute>
              <xsl:for-each select="system/*">
                <mrow><xsl:value-of select="."/></mrow>
              </xsl:for-each>
            </md>
        </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>