document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=547683>Question 547683</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the sum of a two digit number is 9. the number is 12 times the tens digit. find the number </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #356505 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=356505\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> So I will let a represent the tens digit of the number I am looking for and b represent the ones digit.  (so my number will end up in the form ab).\r<BR>\n" );
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document.write( "Since the sum of the two digits is 9 this means:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2Bb=9 ALIGN=MIDDLE  ALT=\"a%2Bb=9\"   DISABLED_style= \"max-width:90%; height:auto;\" >    (1) \r<BR>\n" );
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document.write( "Also, since the number is 12 times the tens digit, this means:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2A12=ab ALIGN=MIDDLE  ALT=\"a%2A12=ab\"   DISABLED_style= \"max-width:90%; height:auto;\" > ((note: ab is the whole number NOT a*b))<BR>\n" );
document.write( "This can be rewritten as <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2Aa%2B2%2Aa=10%2Aa%2Bb ALIGN=MIDDLE  ALT=\"10%2Aa%2B2%2Aa=10%2Aa%2Bb\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "so <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2Aa=b ALIGN=MIDDLE  ALT=\"2%2Aa=b\"   DISABLED_style= \"max-width:90%; height:auto;\" >    (2)<BR>\n" );
document.write( "Substituting (2) into (1) we get:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2B2%2Aa=9 ALIGN=MIDDLE  ALT=\"a%2B2%2Aa=9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3a=9 ALIGN=MIDDLE  ALT=\"3a=9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=3 ALIGN=MIDDLE  ALT=\"a=3\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "And so <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=2%2A3=6 ALIGN=MIDDLE  ALT=\"b=2%2A3=6\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So our number is 36.  \r<BR>\n" );
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document.write( "HOpefully this helps, let me know if you are still unsure:)  </SPAN>\n" );
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