document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=515003>Question 515003</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose you have a cookie stand, and when you charge $3 per cookie box you sell 250 boxes. But when you raise your price to $4 you only sell 120 boxes. \r<BR>\n" );
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document.write( "a.   Write an equation for the number of boxes you sell as a function of the price you charge. \r<BR>\n" );
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document.write( "b.   Denote \"B\" for number of boxes, and \"P\" for the price you charge.\r<BR>\n" );
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document.write( "c.   Assume the function is linear </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #343664 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=343664\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "B=-130P+640<BR>\n" );
document.write( "the two points will be <BR>\n" );
document.write( "P,B<BR>\n" );
document.write( "3, 250<BR>\n" );
document.write( "4, 120<BR>\n" );
document.write( "slope will be 250-120/3-4<BR>\n" );
document.write( "130/-1<BR>\n" );
document.write( "-130<BR>\n" );
document.write( "b=mp+y<BR>\n" );
document.write( "120=-130*4+y<BR>\n" );
document.write( "120=-520+y<BR>\n" );
document.write( "120+520=y<BR>\n" );
document.write( "640=y<BR>\n" );
document.write( "b=-130p+640<BR>\n" );
document.write( "check<BR>\n" );
document.write( "250=-130*3+640<BR>\n" );
document.write( "250=-390+640<BR>\n" );
document.write( "250=640-390<BR>\n" );
document.write( "250=250<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "120=-130*4+640<BR>\n" );
document.write( "120=640-520<BR>\n" );
document.write( "120=120<BR>\n" );
document.write( "ok </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );