document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=91049>Question 91049</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It seems easy to answer but just want to know if my answer I did was right.<BR>\n" );
document.write( "Question:  Suppose you have a lemonade stand, and when you charge $2 per cup of lemonade you sell 120 cups.  But when you raise your price to $3 you only sell 60 cups.  Write an equation for the number of cups you sell  as a function of the price you charge.  Denote \"C\" for number of cups, and \"P\" for the price you charge.  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 #66084 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=66084\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose you have a lemonade stand, and when you charge $2 per cup of lemonade you sell 120 cups.  But when you raise your price to $3 you only sell 60 cups.  Write an equation for the number of cups you sell  as a function of the price you charge.  Denote \"C\" for number of cups, and \"P\" for the price you charge.  Assume the function is linear.<BR>\n" );
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document.write( "You have two points: (2,120), (3,60)<BR>\n" );
document.write( "Find the slope = [120-60]/[2-3] = -60<BR>\n" );
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document.write( "Find the intercept using c=60 when p=3 and m=-60:<BR>\n" );
document.write( "60 = -60*3+b<BR>\n" );
document.write( "60 = -180 + b<BR>\n" );
document.write( "b = 240<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "C = -60p + 240<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );