document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1134131>Question 1134131</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A telephone company offers customers two payment plans for monthly service.\r<BR>\n" );
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document.write( "Plan A costs $5 per month plus $0.10 per minute for calls.\r<BR>\n" );
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document.write( "Plan B costs $8 per month plus $0.07 per minute for calls.\r<BR>\n" );
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document.write( "a) how many minutes of calls would it take for plan A and PLan B to cost the same? Use mathematics to explain how you determined your answer. Use words, symbols, or both in your explanation.\r<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 #751461 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=751461\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let x be the total number of minutes of calls in a month <BR>\n" );
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document.write( "Let C(A) be the cost of plan A and C(B) be the cost of plan B<BR>\n" );
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document.write( "C(A) = 5 +0.10x<BR>\n" );
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document.write( "C(B) = 8 +0.07x<BR>\n" );
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document.write( "For this problem, we want C(A) = C(B)<BR>\n" );
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document.write( "5 +0.10x = 8 +0.07x<BR>\n" );
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document.write( "0.03x = 3<BR>\n" );
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document.write( "x = 3/0.03 = 100 <BR>\n" );
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document.write( "100 minutes of calls in a month results in C(A) = C(B)<BR>\n" );
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document.write( "check the answer<BR>\n" );
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document.write( "C(A) = 5 +0.10 * 100 = $15<BR>\n" );
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document.write( "C(B) = 8 +0.07 * 100 = $15<BR>\n" );
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document.write( "C(A) = C(B) for 100 minutes in a month<BR>\n" );
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