document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=93785>Question 93785</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here is the problem I received on a summer homework packet. I think there is not enough information to answer the question. Here is the question. \r<BR>\n" );
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document.write( "Two cell phone companies are promoting cell phone plans. Company A offers a flat fee of $90.00 per month. Comapny B offers a different plan. It will cost $15.00 per month for service .10 per minute. You will need to compare the two plans to decide which plan is better for you.\r<BR>\n" );
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document.write( "Sketch both equations on the same x - y plane.\r<BR>\n" );
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document.write( "How would you know which plan is better if minutes used or more information is given?\r<BR>\n" );
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document.write( "Thanks,\r<BR>\n" );
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document.write( "Matt </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #68436 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=68436\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Two cell phone companies are promoting cell phone plans. Company A offers a flat fee of $90.00 per month. Company B offers a different plan. It will cost $15.00 per month for service .10 per minute. You will need to compare the two plans to decide which plan is better for you.<BR>\n" );
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document.write( "Sketch both equations on the same x - y plane.<BR>\n" );
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document.write( "Co A plan: y = 90<BR>\n" );
document.write( "Co B plan: y = 15 + .10x, where x is the number of minutes used<BR>\n" );
document.write( "Graph these two equations:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-100%2C+1000%2C+-10%2C+100%2C+90%2C+15%2B.1x%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-100%2C+1000%2C+-10%2C+100%2C+90%2C+15%2B.1x%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "You can also solve this to find out the range of when Plan B is cheaper<BR>\n" );
document.write( ".10x + 15 < 90<BR>\n" );
document.write( ".10x < 90 - 15<BR>\n" );
document.write( ".10x < 75<BR>\n" );
document.write( "x < 75/.1<BR>\n" );
document.write( "x < 750 minutes, plan B is cheaper, greater it's more expensive<BR>\n" );
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document.write( "How would you know which plan is better if minutes used or more information is given?<BR>\n" );
document.write( "It's obvious that you would have to know how many minutes will be used each month.  </SPAN>\n" );
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