document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=198019>Question 198019</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>Algebra and trigonometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A plumber charged $110 for a three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job?<BR>\n" );
document.write( "Assume that this situation can be described by a linear function. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #148501 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=148501\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plumber charged $110 for a three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job?<BR>\n" );
document.write( "Assume that this situation can be described by a linear function.<BR>\n" );
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document.write( "The difference in charges is $50 for a difference of 2 hours, so the hourly rate is $25.<BR>\n" );
document.write( "The overall charge is some base price, plust $25/hour.<BR>\n" );
document.write( "$110 = b + $25*3<BR>\n" );
document.write( "b = $35<BR>\n" );
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document.write( "For 8 hours, charges = $35 + $25*8<BR>\n" );
document.write( "= $235<BR>\n" );
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document.write( "PS  This must be an old math book - plumbers charge a LOT more than that. </SPAN>\n" );
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