document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=135936>Question 135936</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I do not understand how to set up this equation. <BR>\n" );
document.write( "A consumer electronics company sells 6.7 million MP3 players per month at a price of $100 a piece; when the price is lowered to $80, the company sells 10.2 million players per month.  How many MP3 players can the company expect to sell per month at a price of $75? \r<BR>\n" );
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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 #99594 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=99594\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A consumer electronics company sells 6.7 million MP3 players per month at a price of $100 a piece; when the price is lowered to $80, the company sells 10.2 million players per month. How many MP3 players can the company expect to sell per month at a price of $75? <BR>\n" );
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document.write( "You have two points: (100,6.7) and (80,10.2)<BR>\n" );
document.write( "slope = (10.2-6.7)/(80-100) = -7/40<BR>\n" );
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document.write( "Form: y = mx + b<BR>\n" );
document.write( "You have y,x,m; solve for \"b\":<BR>\n" );
document.write( "6.7 = (-7/40)*100 + b<BR>\n" );
document.write( "b = 6.7 + 17.5<BR>\n" );
document.write( "b = 24.2<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "# sold = (-7/40)x  +24.2 million where x is price per unit<BR>\n" );
document.write( "#(75) = (-7/40)*75 + 24.2<BR>\n" );
document.write( "#(75) = 11.075 million<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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