document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1104877>Question 1104877</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can you please help me with this math problem PLEASE!  \r<BR>\n" );
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document.write( "Navy is trying to decide what would be the best cell phone plan for her. She has narrowed her choices down to two. Spirit and Horizon. Spirit has a fixed fee of $20 and an additional charge of 5 cents per minute. Horizon has no fixed fee and charges 15 cents per minute. Form a systems of equation for this problem. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #719593 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=719593\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let x equal the number of minutes.\r<BR>\n" );
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document.write( "spirit charges 10 + .05 * x.\r<BR>\n" );
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document.write( "horizon charges .15 * x\r<BR>\n" );
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document.write( "she wants to compare what spirit charges versus what horizon charges and where the break even point would be.\r<BR>\n" );
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document.write( "at least i think that's what she wants to do.\r<BR>\n" );
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document.write( "both plans will break even when the cost for each plan is the same.\r<BR>\n" );
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document.write( "the cost for spirit is 20 + .05 * x\r<BR>\n" );
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document.write( "the cost for horizon is .15 * x.\r<BR>\n" );
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document.write( "when the cost is even, then 20 + .05 * x = .15 * x\r<BR>\n" );
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document.write( "subtract .05 * x from both sides of this equation to get 20 = .10 * x\r<BR>\n" );
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document.write( "divide both sides of this equation by .10 to get 20 /.10 = x\r<BR>\n" );
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document.write( "solve for x to get x = 200.\r<BR>\n" );
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document.write( "the plans will break even when the number of minutes used per month = 200.\r<BR>\n" );
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document.write( "if she uses less than 200 minutes, the horizon plan is cheaper.\r<BR>\n" );
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document.write( "if she uses more than 200 minutes, the spirit plan is cheaper.\r<BR>\n" );
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document.write( "your system of equations is:\r<BR>\n" );
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document.write( "cost for spirit plan = 20 + .05 * x.<BR>\n" );
document.write( "cost for horizon plan = .15 * x\r<BR>\n" );
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document.write( "we'll look at a couple of sample figures.\r<BR>\n" );
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document.write( "100 is less than 200.<BR>\n" );
document.write( "cost for spirit is 20 + .05 * 100 = 25.<BR>\n" );
document.write( "cost for horizon is .15 * 100 = 15.<BR>\n" );
document.write( "horizon is cheaper.\r<BR>\n" );
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document.write( "200 is equal to 200.<BR>\n" );
document.write( "cost for spirit is 20 + .05 * 200 = 30<BR>\n" );
document.write( "cost for horizon is .15 * 200 = 30<BR>\n" );
document.write( "they break even.\r<BR>\n" );
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document.write( "300 is greater than 200.<BR>\n" );
document.write( "cost for spirit is 20 + .05 * 300 = 35<BR>\n" );
document.write( "cost for horizon is .15 *300 = 45<BR>\n" );
document.write( "spirit is cheaper.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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