document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1002271>Question 1002271</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You want to take your class in a field trip to the field museum in Chicago. The total cost of the trip will include the fixed fee for the bus; each person must pay an admission fee to enter the museum. To take 10 people on the trip, it will cost $1400; to take 15 people it will cost $1475. For 20 people it would cost $1550.<BR>\n" );
document.write( "A. Find the bus fee<BR>\n" );
document.write( "B. Find a formula that gives the cost of the field trip, C, in terms of the number of people,p, on the trip. <BR>\n" );
document.write( "C. You get a donation of $1800 to pay for expenses for this trip. How many people can you bring?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #619199 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39623)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=619199\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The description gives points  (p,C):<BR>\n" );
document.write( "(10,1400), (15,1475), (20,1550).\r<BR>\n" );
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document.write( "Slopes among the successive points are<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281475-1400%29%2F%2815-5%29=15 ALIGN=MIDDLE  ALT=\"%281475-1400%29%2F%2815-5%29=15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281550-1475%29%2F%2820-15%29=15 ALIGN=MIDDLE  ALT=\"%281550-1475%29%2F%2820-15%29=15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "both slopes being the same, 15.<BR>\n" );
document.write( "The points have a linear fit.\r<BR>\n" );
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document.write( "Picking the first data point and using point-slope form,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C-1400=15%28p-10%29 ALIGN=MIDDLE  ALT=\"C-1400=15%28p-10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C-1400=15p-150 ALIGN=MIDDLE  ALT=\"C-1400=15p-150\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C=15p-150%2B1400 ALIGN=MIDDLE  ALT=\"C=15p-150%2B1400\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28C=15p%2B1250%29 ALIGN=MIDDLE  ALT=\"highlight%28C=15p%2B1250%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >------Formula for cost as a function of how many attend.\r<BR>\n" );
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document.write( "The bus cost by itself is  $1250.\r<BR>\n" );
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document.write( "The last question means <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15p%2B1400=1800 ALIGN=MIDDLE  ALT=\"15p%2B1400=1800\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and you want to solve for the value of p.<BR>\n" );
document.write( " </SPAN>\n" );
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