document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=547231>Question 547231</A>: <I><SPAN STYLE=\"word-break: break-all;\"> David is 3 years older than his brother in 2 years the sum of thier ages will be 19.  How old are David and his brother?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #356303 by </B><A HREF=/tutors/aboutme.mpl?userid=mathie123><B>mathie123(224)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathie123><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=356303\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let d be the age of David now and b be the age of his brother now.  <BR>\n" );
document.write( "From the given information we have:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%2B3=d ALIGN=MIDDLE  ALT=\"b%2B3=d\"   DISABLED_style= \"max-width:90%; height:auto;\" >              (1)<BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28d%2B2%29%2B%28b%2B2%29=19 ALIGN=MIDDLE  ALT=\"%28d%2B2%29%2B%28b%2B2%29=19\"   DISABLED_style= \"max-width:90%; height:auto;\" >     (2)\r<BR>\n" );
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document.write( "Substituting (1) into (2) <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28b%2B3%2B2%29%2B%28b%2B2%29=19 ALIGN=MIDDLE  ALT=\"%28b%2B3%2B2%29%2B%28b%2B2%29=19\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2b%2B7=19 ALIGN=MIDDLE  ALT=\"2b%2B7=19\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2b=19-7 ALIGN=MIDDLE  ALT=\"2b=19-7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2b=12 ALIGN=MIDDLE  ALT=\"2b=12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282b%29%2F2=%2812%29%2F2 ALIGN=MIDDLE  ALT=\"%282b%29%2F2=%2812%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=6 ALIGN=MIDDLE  ALT=\"b=6\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Using (1) we get that <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=6%2B3 ALIGN=MIDDLE  ALT=\"d=6%2B3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=9 ALIGN=MIDDLE  ALT=\"d=9\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Therefore David is 9 and his brother is 6.  \r<BR>\n" );
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