document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=259627>Question 259627</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When making a telephone call using a calling card, a call lasting 6 minutes costs 1.65.  A call lasting 16 minutes costs 3.65.  Find a linear function that relates the cost of making a call (C) to the length of the call (x).   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #191087 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=191087\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The points are (6,1.65) and (16, 3.65)<BR>\n" );
document.write( "Here we have x,c instead of x,y<BR>\n" );
document.write( "c-c/x-x=m <BR>\n" );
document.write( "3.65-1.65/16-6=m<BR>\n" );
document.write( "2/10=1/5<BR>\n" );
document.write( "c=1/5*x+b<BR>\n" );
document.write( "1.65=1/5(6)+b<BR>\n" );
document.write( "1.65=6/5+b<BR>\n" );
document.write( "1.65*5/6=b<BR>\n" );
document.write( "1.375=b<BR>\n" );
document.write( "C=x/5+1.375<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );