document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=392182>Question 392182</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of -0.14. See the figure below.\r<BR>\n" );
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document.write( "There is $26.02 in credit remaining on the card after 43 minutes of calls. How much credit was there after 32 minutes of calls?<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 #278346 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=278346\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). <BR>\n" );
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document.write( "credit = m(call time) + b<BR>\n" );
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document.write( "When graphed, the function gives a line with a slope of -0.14. <BR>\n" );
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document.write( "m = -0.14<BR>\n" );
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document.write( "See the figure below.<BR>\n" );
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document.write( "There is $26.02 in credit remaining on the card after 43 minutes of calls. <BR>\n" );
document.write( "26.02 = -0.14(43) + b<BR>\n" );
document.write( "b = 26.02+6.02<BR>\n" );
document.write( "b = 32.04<BR>\n" );
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document.write( "C(x) = -0.14x+32.04<BR>\n" );
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document.write( "How much credit was there after 32 minutes of calls?<BR>\n" );
document.write( "C(32) = -0.14(32) + 32.04<BR>\n" );
document.write( "C(32) = $27.56<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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