document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=598472>Question 598472</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mary is driving to San Francisco. Suppose that the remaining distance to drive (in miles) is a linear function of her driving time (in minutes). When graphed, the function gives a line with a slope of -0.9 . \r<BR>\n" );
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document.write( "Mary has 75 miles  remaining after 50 minutes of driving. How many miles will be remaining after 64 minutes of driving?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #378622 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=378622\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mary is driving to San Francisco. Suppose that the remaining distance to drive (in miles) is a linear function of her driving time (in minutes). When graphed, the function gives a line with a slope of -0.9 . \r<BR>\n" );
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document.write( "Mary has 75 miles  remaining after 50 minutes of driving. How many miles will be remaining after 64 minutes of driving?<BR>\n" );
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document.write( "The function will have the form d = m*t + d0<BR>\n" );
document.write( "where d0 = the distance remaining at t=0 and m is the slope<BR>\n" );
document.write( "Given: m = -0.9, d=75,t=50<BR>\n" );
document.write( "Use this information to solve for d0:<BR>\n" );
document.write( "75 = -0.9*50 + d0<BR>\n" );
document.write( "d0 = 75 + 45 = 120<BR>\n" );
document.write( "So the equation is d = -0.9t + 120<BR>\n" );
document.write( "Solve for d when t=64:<BR>\n" );
document.write( "d = -0.9*64 + 120<BR>\n" );
document.write( "d = 62.4 minutes </SPAN>\n" );
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