document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=124751>Question 124751</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help with this word problem.\r<BR>\n" );
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document.write( "After 8 months of use, the value of Kathy's computer had depreciated to $890.  After 10 months, the value had gone down to $750.  Assume that the value of the computer, V, is a linear function of the number of months of use, t.\r<BR>\n" );
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document.write( "a) Write an equation for the value of the computer after t months of use.<BR>\n" );
document.write( "b) How much did the computer cost originally?<BR>\n" );
document.write( "c) What was the monthly depreciation? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #91460 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=91460\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> After 8 months of use, the value of Kathy's computer had depreciated to $890. After 10 months, the value had gone down to $750. Assume that the value of the computer, V, is a linear function of the number of months of use, t.<BR>\n" );
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document.write( "You have two points:<BR>\n" );
document.write( "(8,890) and (10,750)<BR>\n" );
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document.write( "a) Write an equation for the value of the computer after t months of use.<BR>\n" );
document.write( "Slope = (750-890)/(10-8) = -140/2 = -70<BR>\n" );
document.write( "Form is V=mt+b ; you have V, m, t, and can solve for \"b\".<BR>\n" );
document.write( "750 = -70*10 + b<BR>\n" );
document.write( "b = 1450<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "V(t)=-70t + 1450<BR>\n" );
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document.write( "b) How much did the computer cost originally?<BR>\n" );
document.write( "V(0) = -70*0+1450 = 1450<BR>\n" );
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document.write( "c) What was the monthly depreciation?<BR>\n" );
document.write( "$70<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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