document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=145573>Question 145573</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Free Market. The function S=5000+200x and D= 9500-100x express the supply S and the Demand D, respectively, for a popular compact disc brand as a function if its price x (in dollars).\r<BR>\n" );
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document.write( "a)Graph the functions 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 called the equilibrium price. What is the equilibrium price? <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #106258 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=106258\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28600%2C600%2C-10%2C100%2C-100%2C10000%2C5000%2B200x%2C9500-100x%29 ALIGN=MIDDLE  ALT=\"graph%28600%2C600%2C-10%2C100%2C-100%2C10000%2C5000%2B200x%2C9500-100x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The green line is the Demand equation.\r<BR>\n" );
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document.write( "b.  Pick a number for x.  Put it into the Supply equation and do the arithmetic.  Then pick a larger number for x.  Put it into the Supply equation and do the arithmetic.  What happened to S when x got larger?  That's your answer.\r<BR>\n" );
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document.write( "c.  Do the same thing for the Demand equation.\r<BR>\n" );
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document.write( "d.  If you want to find the point where Supply equals Demand, set the two expressions equal to each other:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5000%2B200x=9500-200x ALIGN=MIDDLE  ALT=\"5000%2B200x=9500-200x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now solve for x. </SPAN>\n" );
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