document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148963>Question 148963</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109321 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=109321\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours.<BR>\n" );
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document.write( "You have two points relating hours and cost:<BR>\n" );
document.write( "(2,140) and (5,290)<BR>\n" );
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document.write( "slope = (290-140)/(5-2) = 150/3 = 50<BR>\n" );
document.write( "Form: y = mx + b <BR>\n" );
document.write( "140 = 50*2 + b<BR>\n" );
document.write( "b = 40<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "Cost(x) = 50x + 40<BR>\n" );
document.write( "C(4) = 5*4 + 40<BR>\n" );
document.write( "C(4) = $60<BR>\n" );
document.write( "===============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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