document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=827373>Question 827373</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 10 minute cab ride costs $7.50. A 15 minute cab ride costs $12.50. Write a linear model to model the situation and use it to predict how much a 30 minute cab ride would cost. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #498636 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=498636\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A 10 minute cab ride costs $7.50. A 15 minute cab ride costs $12.50. Write a linear model to model the situation and use it to predict how much a 30 minute cab ride would cost.<BR>\n" );
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document.write( "You have two points (10,7.50) and (15,12.50)<BR>\n" );
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document.write( "slope = (12.5-7.5)/(15-10) = 5/5 = 1<BR>\n" );
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document.write( "Form: y = mx + b<BR>\n" );
document.write( "7.5 = 1*10 + b<BR>\n" );
document.write( "b = -2.5<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "f(x) = x - 2.5<BR>\n" );
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document.write( "f(30) = 30-2.5 = $27.50<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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