document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=84104>Question 84104</A>: <I><SPAN STYLE=\"word-break: break-all;\"> During the week a man used 500 minutes of internet time and 100 minutes of phone time; his bill was $88.   The next week he used 400 minutes of internet time and  150 minutes of phone time; his bill was $76.   Find the cost per minute for the internet service.  You must state your 2 equations and then your answers.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #60534 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=60534\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bi%5D ALIGN=MIDDLE  ALT=\"t%5Bi%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time on the internet in minutes<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bp%5D ALIGN=MIDDLE  ALT=\"t%5Bp%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time on the phone in minutes<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5Bi%5D ALIGN=MIDDLE  ALT=\"r%5Bi%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate for internet use in dollars/minute<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5Bp%5D ALIGN=MIDDLE  ALT=\"r%5Bp%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate for phone use in dollars/minute<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b ALIGN=MIDDLE  ALT=\"b\"   DISABLED_style= \"max-width:90%; height:auto;\" > = total bill for phone and internet<BR>\n" );
document.write( "----------------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b+=+t%5Bi%5D%2Ar%5Bi%5D+%2B+t%5Bp%5D%2Ar%5Bp%5D ALIGN=MIDDLE  ALT=\"b+=+t%5Bi%5D%2Ar%5Bi%5D+%2B+t%5Bp%5D%2Ar%5Bp%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=500%2Ar%5Bi%5D+%2B+100%2Ar%5Bp%5D+=+88 ALIGN=MIDDLE  ALT=\"500%2Ar%5Bi%5D+%2B+100%2Ar%5Bp%5D+=+88\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=400%2Ar%5Bi%5D+%2B+150%2Ar%5Bp%5D+=+76 ALIGN=MIDDLE  ALT=\"400%2Ar%5Bi%5D+%2B+150%2Ar%5Bp%5D+=+76\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply the 1st equation by 3 and the 2nd by 2<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1500%2Ar%5Bi%5D+%2B+300%2Ar%5Bp%5D+=+264 ALIGN=MIDDLE  ALT=\"1500%2Ar%5Bi%5D+%2B+300%2Ar%5Bp%5D+=+264\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=800%2Ar%5Bi%5D+%2B+300%2Ar%5Bp%5D+=+152 ALIGN=MIDDLE  ALT=\"800%2Ar%5Bi%5D+%2B+300%2Ar%5Bp%5D+=+152\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "subtract the 2nd from the 1st<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=700%2Ar%5Bi%5D+=+112 ALIGN=MIDDLE  ALT=\"700%2Ar%5Bi%5D+=+112\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B1%5D+=+.16 ALIGN=MIDDLE  ALT=\"r%5B1%5D+=+.16\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So, the rate for internet use is 16 cents/minute<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );