document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1073319>Question 1073319</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Problem Page<BR>\n" );
document.write( "The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using 13 HCF of water is $35.55 and the cost for using 36 HCF is $73.50. What is the cost for using 16 HCF of water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #688159 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39630)</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=688159\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Two points on the line are  (13, 35.55) and (36, 73.50).\r<BR>\n" );
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document.write( "What is the missing value, (16, v)?\r<BR>\n" );
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document.write( "Two choices.  Linear interpolation, or equation of the line containing the two described points.  The solution used here will be equation of the line.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-35.55=%28%2873.5-35.55%29%2F%2836-13%29%29%28x-13%29 ALIGN=MIDDLE  ALT=\"y-35.55=%28%2873.5-35.55%29%2F%2836-13%29%29%28x-13%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, which is in the point-slope form.  Cost here is y.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-35.55=%2837.95%2F23%29%28x-13%29 ALIGN=MIDDLE  ALT=\"y-35.55=%2837.95%2F23%29%28x-13%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-35=%281.65%29%28x-13%29 ALIGN=MIDDLE  ALT=\"y-35=%281.65%29%28x-13%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=1.65x-%281.65%29%2A13%2B35.55 ALIGN=MIDDLE  ALT=\"y=1.65x-%281.65%29%2A13%2B35.55\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28y=1.65x%2B14.1%29 ALIGN=MIDDLE  ALT=\"highlight_green%28y=1.65x%2B14.1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Cost for 16 HCF of water?<BR>\n" );
document.write( "x=16.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=1.65%2A16%2B14.1=highlight%2840.5%29%29 ALIGN=MIDDLE  ALT=\"highlight%28y=1.65%2A16%2B14.1=highlight%2840.5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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