document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1148037>Question 1148037</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 14  hours of burning, a candle has a height of 18.2  centimeters. After 31  hours of burning, its height is 14.8  centimeters. What is the height of the candle after 21  hours? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #769408 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=769408\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You are given 2 points on a straight line<BR>\n" );
document.write( "( 14, 18.2 )<BR>\n" );
document.write( "( 31, 14.8 )<BR>\n" );
document.write( "Use the general point-slope formula to get the equation<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+%28+18.2+-+14.8+%29+%2F+%28+14+-+31+%29+ ALIGN=MIDDLE  ALT=\"+%28+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+%28+18.2+-+14.8+%29+%2F+%28+14+-+31+%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+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+3.4+%2F+%28-17%29+ ALIGN=MIDDLE  ALT=\"+%28+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+3.4+%2F+%28-17%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+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+-.2+ ALIGN=MIDDLE  ALT=\"+%28+h+-+14.8+%29+%2F+%28+t+-+31+%29+=+-.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+-+14.8+=+-.2%2A%28+t+-+31+%29+ ALIGN=MIDDLE  ALT=\"+h+-+14.8+=+-.2%2A%28+t+-+31+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+-+14.8+=+-.2t+%2B+6.2+ ALIGN=MIDDLE  ALT=\"+h+-+14.8+=+-.2t+%2B+6.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+-.2t+%2B+21+ ALIGN=MIDDLE  ALT=\"+h+=+-.2t+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "------------------------------<BR>\n" );
document.write( "Now find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+ ALIGN=MIDDLE  ALT=\"+h+\"   DISABLED_style= \"max-width:90%; height:auto;\" > at the point ( 21, h )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+-.2t+%2B+21+ ALIGN=MIDDLE  ALT=\"+h+=+-.2t+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+-.2%2A21+%2B+21+ ALIGN=MIDDLE  ALT=\"+h+=+-.2%2A21+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+-4.2+%2B+21+ ALIGN=MIDDLE  ALT=\"+h+=+-4.2+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+16.8+ ALIGN=MIDDLE  ALT=\"+h+=+16.8+\"   DISABLED_style= \"max-width:90%; height:auto;\" > cm<BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "check the equation:<BR>\n" );
document.write( "( 14, 18.2 )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h+=+-.2t+%2B+21+ ALIGN=MIDDLE  ALT=\"+h+=+-.2t+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18.2+=+-.2%2A14+%2B+21+ ALIGN=MIDDLE  ALT=\"+18.2+=+-.2%2A14+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18.2+=+-2.8+%2B+21+ ALIGN=MIDDLE  ALT=\"+18.2+=+-2.8+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18.2+=+18.2+ ALIGN=MIDDLE  ALT=\"+18.2+=+18.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "You can check the other point\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );