document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1047208>Question 1047208</A>: <I><SPAN STYLE=\"word-break: break-all;\"> C = 3n + 210<BR>\n" );
document.write( "C = 10n\r<BR>\n" );
document.write( "\n" );
document.write( "How is the answer 10n? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #662709 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=662709\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I'm guessing that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+C+=+10n+ ALIGN=MIDDLE  ALT=\"+C+=+10n+\"   DISABLED_style= \"max-width:90%; height:auto;\" > isn't<BR>\n" );
document.write( "actually the answer.<BR>\n" );
document.write( "I think that you are being given 2<BR>\n" );
document.write( "equations:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+C+=+3n+%2B+210+ ALIGN=MIDDLE  ALT=\"+C+=+3n+%2B+210+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+C+=+10n+ ALIGN=MIDDLE  ALT=\"+C+=+10n+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Both of these can be true, but only for<BR>\n" );
document.write( "1 value of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+n+ ALIGN=MIDDLE  ALT=\"+n+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "------------------------------------<BR>\n" );
document.write( "That is because they are straight lines which<BR>\n" );
document.write( "can only intersect in 1 point.<BR>\n" );
document.write( "Now I will find that point ( the solution )<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Substitute (2) into (1)<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10n+=+3n+%2B+210+ ALIGN=MIDDLE  ALT=\"+10n+=+3n+%2B+210+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+7n+=+210+ ALIGN=MIDDLE  ALT=\"+7n+=+210+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+n+=+30+ ALIGN=MIDDLE  ALT=\"+n+=+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( what they are looking for )<BR>\n" );
document.write( "and also:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+C+=+10%2A30+ ALIGN=MIDDLE  ALT=\"+C+=+10%2A30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+C+=+300+ ALIGN=MIDDLE  ALT=\"+C+=+300+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "So, the point of intersection is ( 30, 300 )<BR>\n" );
document.write( "Here is the plot of both lines:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+400%2C+400%2C+-10%2C+100%2C+-60%2C+600%2C+3x+%2B+210%2C+10x+%29+ ALIGN=MIDDLE  ALT=\"+graph%28+400%2C+400%2C+-10%2C+100%2C+-60%2C+600%2C+3x+%2B+210%2C+10x+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );