document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1147333>Question 1147333</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 30 minutes of calls is $16.10, and the remaining credit after 59 minutes of calls is $12.33. What is the remaining credit after 79 minutes of calls? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #768726 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=768726\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> points  (30, 16.1) & (59, 12.33)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-16.1=%28%2812.33-16.1%29%2F%2859-30%29%29%28x-30%29 ALIGN=MIDDLE  ALT=\"y-16.1=%28%2812.33-16.1%29%2F%2859-30%29%29%28x-30%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=%28%2812.33-16.1%29%2F%2859-30%29%29%28x-30%29%2B16.1 ALIGN=MIDDLE  ALT=\"y=%28%2812.33-16.1%29%2F%2859-30%29%29%28x-30%29%2B16.1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Simplify the formula.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Let x be 79 and evaluate y to answer the question. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );