document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=941279>Question 941279</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The phone company Ringular has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 160 minutes, the monthly cost will be $49. If the customer uses 710 minutes, the monthly cost will be $104.\r<BR>\n" );
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document.write( "A) Find an equation in the form y = m x + b, where x is the number of monthly minutes used and y is the total monthly of the Ringular plan.\r<BR>\n" );
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document.write( "B) Use your equation to find the total monthly cost if 611 minutes are used. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #573766 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=573766\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> given these two x,y pairs on the linear equation:<BR>\n" );
document.write( "(160, 49)<BR>\n" );
document.write( "(710, 104)<BR>\n" );
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document.write( "slope = m = dy/dx<BR>\n" );
document.write( "m = (104-49)/(710-160)<BR>\n" );
document.write( "m = 0.1<BR>\n" );
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document.write( "a) the linear equation:<BR>\n" );
document.write( "y - 49 = 0.1(x - 160)<BR>\n" );
document.write( "y = 0.1x - 16 + 49<BR>\n" );
document.write( "y = 0.1x + 33<BR>\n" );
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document.write( "b) cost for 611 minutes/month<BR>\n" );
document.write( "y = 0.1x + 33<BR>\n" );
document.write( "y = 0.1*611 + 33<BR>\n" );
document.write( "y = $94.10<BR>\n" );
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