document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1084771>Question 1084771</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A vendor has learned that, by pricing pretzels at $1.00, sales will reach 92 pretzels per day. Raising the price to $1.50 will cause the sales to fall to 72 pretzels per day. Let y be the number of pretzels the vendor sells at x dollars each. Write a linear equation that models the number of pretzels sold per day when the price is x dollars each.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #698827 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=698827\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You want to plot [ number of pretzels/day ] on the vertical axis<BR>\n" );
document.write( "and [ price / pretzel ] on the horizontal axis<BR>\n" );
document.write( "-----------------------------------------<BR>\n" );
document.write( "You are given 2 points, which are:<BR>\n" );
document.write( "( 1, 92 )<BR>\n" );
document.write( "( 1.5, 72 )<BR>\n" );
document.write( "Use the general point-slope formula to get the equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+y+-+72+%29+%2F+%28+x+-+1.5+%29+=+%28+92+-+72+%29+%2F+%28+1+-+1.5+%29+ ALIGN=MIDDLE  ALT=\"+%28+y+-+72+%29+%2F+%28+x+-+1.5+%29+=+%28+92+-+72+%29+%2F+%28+1+-+1.5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+y+-+72+%29+%2F+%28+x+-+1.5+%29+=+20+%2F+%28-.5+%29+ ALIGN=MIDDLE  ALT=\"+%28+y+-+72+%29+%2F+%28+x+-+1.5+%29+=+20+%2F+%28-.5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28-.5%29%2A%28+x+-+1.5+%29+ ALIGN=MIDDLE  ALT=\"+%28-.5%29%2A%28+x+-+1.5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+-.5+%29%2A%28+y+-+72+%29+=+20%2A%28+x++-+1.5+%29+ ALIGN=MIDDLE  ALT=\"+%28+-.5+%29%2A%28+y+-+72+%29+=+20%2A%28+x++-+1.5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-.5y+%2B+36+=+20x+-+30+ ALIGN=MIDDLE  ALT=\"+-.5y+%2B+36+=+20x+-+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-.5y+=+20x+-+66+ ALIGN=MIDDLE  ALT=\"+-.5y+=+20x+-+66+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+-40x+%2B+132+ ALIGN=MIDDLE  ALT=\"+y+=+-40x+%2B+132+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "does it go through ( 1,92 ) ?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+-40x+%2B+132+ ALIGN=MIDDLE  ALT=\"+y+=+-40x+%2B+132+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+92+=+-40%2A1+%2B+132+ ALIGN=MIDDLE  ALT=\"+92+=+-40%2A1+%2B+132+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+92+=+92+ ALIGN=MIDDLE  ALT=\"+92+=+92+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "does it go through ( 1.5, 72 ) ?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+72+=+-40%2A1.5+%2B+132+ ALIGN=MIDDLE  ALT=\"+72+=+-40%2A1.5+%2B+132+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+72+=+-60+%2B+132+ ALIGN=MIDDLE  ALT=\"+72+=+-60+%2B+132+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+72+=+72+ ALIGN=MIDDLE  ALT=\"+72+=+72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );