document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=840818>Question 840818</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Book store sold 40cds & videos the 1st week at $4 per cd $6per videos.  Sales for both total $180. Write a system of equations to represent the situation and graph the system if equations. <BR>\n" );
document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #506439 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39623)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=506439\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> d for count of disks<BR>\n" );
document.write( "v for count of videos\r<BR>\n" );
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document.write( "Account for the count:  d+v=40<BR>\n" );
document.write( "Account for sales revenue:  4d+6v=180\r<BR>\n" );
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document.write( "The revenue equation should be simplified, dividing left and right by 2:<BR>\n" );
document.write( "2d+3v=90\r<BR>\n" );
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document.write( "Elimination Method on THIS system would be most convenient:<BR>\n" );
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document.write( "2d+3v=90<BR>\n" );
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document.write( "d+v=40<BR>\n" );
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document.write( "...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28v=10%29 ALIGN=MIDDLE  ALT=\"highlight%28v=10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, done in head; I used multiplication of the \"40\" equation by 2 and subtracted from the \"90\" equation.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28d=30%29 ALIGN=MIDDLE  ALT=\"highlight%28d=30%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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