document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=181586>Question 181586</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780136007319/algebrahomeworkh>Beginning & Intermediate Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I need help with learning how to solve word problems using the system of linear equations. I can do the problem if I just have to use one equation, but I am not quite sure of how to do it when you have to use 2 equations........PLS HELP\r<BR>\n" );
document.write( "\n" );
document.write( "Twice last month, Judy rented a car from Enterprise in Freson, CA and traveled around the Southwest on business, Enterprise rents its cars for a daily fee, plus an additional charge per mile driven. Judy recalls that her first trip lasted 4 days, she drove 450 miles, and the rental cost her $240.50. On her second business tripshe drove 200 miles in 3 days, and paid 146.00 for the rental. Find the daily fee and milage charge.\r<BR>\n" );
document.write( "\n" );
document.write( "Thanks in advance to anyone who is able to help me with 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 #136178 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=136178\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let d be the daily cost and m be the cost per mile<BR>\n" );
document.write( "So the cost is given by<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Cost+=+Day%2Ad+%2B+Miles+%2Am ALIGN=MIDDLE  ALT=\"Cost+=+Day%2Ad+%2B+Miles+%2Am\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "For the first trip<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=240.50+=+4+%2A+d+%2B+450m ALIGN=MIDDLE  ALT=\"240.50+=+4+%2A+d+%2B+450m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "For the second trip<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146.00+=+3%2Ad+%2B+200m ALIGN=MIDDLE  ALT=\"146.00+=+3%2Ad+%2B+200m\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "So you have 2 equations and 2 unknowns. You can solve this\r<BR>\n" );
document.write( "\n" );
document.write( "We'll use substitution<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=240.50+=+4+%2A+d+%2B+450m ALIGN=MIDDLE  ALT=\"240.50+=+4+%2A+d+%2B+450m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28240.50+-+450m%29%2F4+=+d+ ALIGN=MIDDLE  ALT=\"%28240.50+-+450m%29%2F4+=+d+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146.00+=+3%2Ad+%2B+200m ALIGN=MIDDLE  ALT=\"146.00+=+3%2Ad+%2B+200m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146.00+=+3%2A%28240.50+-+450m%29%2F4+%2B+200m ALIGN=MIDDLE  ALT=\"146.00+=+3%2A%28240.50+-+450m%29%2F4+%2B+200m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146.00+=+180.375+-+337.5m+%2B+200m ALIGN=MIDDLE  ALT=\"146.00+=+180.375+-+337.5m+%2B+200m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-34.375+=+-137.5m ALIGN=MIDDLE  ALT=\"-34.375+=+-137.5m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.25+=+m ALIGN=MIDDLE  ALT=\"0.25+=+m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So it costs 25 cents per mile\r<BR>\n" );
document.write( "\n" );
document.write( "Now use that value for m, to solve for d<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146.00+=+3%2Ad+%2B+200m ALIGN=MIDDLE  ALT=\"146.00+=+3%2Ad+%2B+200m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146+=+3d+%2B+200%280.025%29 ALIGN=MIDDLE  ALT=\"146+=+3d+%2B+200%280.025%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=146+=+3d+%2B+50 ALIGN=MIDDLE  ALT=\"146+=+3d+%2B+50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=96+=+3d ALIGN=MIDDLE  ALT=\"96+=+3d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=32+=+d ALIGN=MIDDLE  ALT=\"32+=+d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "It costs 32 per day\r<BR>\n" );
document.write( "\n" );
document.write( "Check your answer <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=240.50+=+4+%2A+d+%2B+450m ALIGN=MIDDLE  ALT=\"240.50+=+4+%2A+d+%2B+450m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Does 240.50 = 4*32 + 450(0.25) ???<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );