document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=989232>Question 989232</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 280 minutes, the monthly cost will be $165. If the customer uses 570 minutes, the monthly cost will be $310.\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. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #609604 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=609604\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "x=per minute charge; b=flat monthly fee; y=total monthly charge<BR>\n" );
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document.write( "mx+b=y<BR>\n" );
document.write( "280x+b=$165<BR>\n" );
document.write( "570x+b=$310 Subtract second equation from first.<BR>\n" );
document.write( "-290x=-$145<BR>\n" );
document.write( "x=$0.50<BR>\n" );
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document.write( "$0.50(280)+b=$165<BR>\n" );
document.write( "$140+b=$165<BR>\n" );
document.write( "b=$25<BR>\n" );
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document.write( "ANSWER: y=$0.50x+$25<BR>\n" );
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document.write( "CHECK<BR>\n" );
document.write( "$0.50(570)+$25=$310<BR>\n" );
document.write( "$285+$25=$310<BR>\n" );
document.write( "$310=$310<BR>\n" );
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