document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=179975>Question 179975</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Free market. The equations S = 5000 + 200x and<BR>\n" );
document.write( "D = 9500 - 100x express the supply S and the<BR>\n" );
document.write( "demand D, respectively, for a popular compact disc brand<BR>\n" );
document.write( "in terms of its price x (in dollars).<BR>\n" );
document.write( "a) Graph the equations on the same coordinate system.<BR>\n" );
document.write( "b) What happens to the supply as the price increases?<BR>\n" );
document.write( "c) What happens to the demand as the price increases?<BR>\n" );
document.write( "d) The price at which supply and demand are equal is<BR>\n" );
document.write( "called the equilibrium price. What is the equilibrium<BR>\n" );
document.write( "price?\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #134857 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=134857\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The equations S = 5000 + 200x and<BR>\n" );
document.write( "D = 9500 - 100x express the supply S and the<BR>\n" );
document.write( "demand D, respectively, for a popular compact disc brand<BR>\n" );
document.write( "in terms of its price x (in dollars).<BR>\n" );
document.write( "=============================================================<BR>\n" );
document.write( "a) Graph the equations on the same coordinate system.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28400%2C300%2C-10%2C30%2C-10%2C20000%2C5000%2B200x%2C9500-100x%29 ALIGN=MIDDLE  ALT=\"graph%28400%2C300%2C-10%2C30%2C-10%2C20000%2C5000%2B200x%2C9500-100x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------------------------------------------------<BR>\n" );
document.write( "b) What happens to the supply as the price increases?<BR>\n" );
document.write( "supply increases because the slope is positive; it is 200.<BR>\n" );
document.write( "-----------------------------------------------------------<BR>\n" );
document.write( "c) What happens to the demand as the price increases?<BR>\n" );
document.write( "Demand decreases because the slope is negative; it is -100<BR>\n" );
document.write( "-----------------------------------------------------------<BR>\n" );
document.write( "d) The price at which supply and demand are equal is<BR>\n" );
document.write( "called the equilibrium price. What is the equilibrium<BR>\n" );
document.write( "price? <BR>\n" );
document.write( "5000 + 200x  = 9500 - 100x<BR>\n" );
document.write( "300x = 4500<BR>\n" );
document.write( "x = $15<BR>\n" );
document.write( "==============================================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );