document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=157043>Question 157043</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Al makes $30 an hour. Bill makes $20 an hour. Bill joins Al on the job four hours after Al started. They finish the job, and the total cost for labor comes to $470. How many hours did each work? \r<BR>\n" );
document.write( "\n" );
document.write( "By trial and error, I know that the number of hours is 11 for Al and 7 for Bill. I just need to show the work. \r<BR>\n" );
document.write( "\n" );
document.write( "Al    - 11 hours @ $30/hour = 330<BR>\n" );
document.write( "Bill  -  7 hours @ $20/hour = 140<BR>\n" );
document.write( "                    Total =   470\r<BR>\n" );
document.write( "\n" );
document.write( "Here is the equation that I came up with for figuring the number of hours each worked - where X=Al's hours and X-4 = Bill's hours. I'm fairly certain this equation is correct. \r<BR>\n" );
document.write( "\n" );
document.write( "$470 = 30X + 20(x-4)\r<BR>\n" );
document.write( "\n" );
document.write( "It's at this point that I get stuck. Any help would be greatly appreciated! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #115805 by </B><A HREF=/tutors/aboutme.mpl?userid=jojo14344><B>jojo14344(1513)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jojo14344><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=115805\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Your on the ball amigo but a little bit of refinishing to do there.<BR>\n" );
document.write( "Okay, let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" >= no. of hours they work<BR>\n" );
document.write( "But you see, Al is already ahead of 4 hours, so total no. of hours for him is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2B4 ALIGN=MIDDLE  ALT=\"x%2B4\"   DISABLED_style= \"max-width:90%; height:auto;\" > right? Then putting everything into equation:<BR>\n" );
document.write( "Al=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%2430%2Fhr%29%28x%2B4%29 ALIGN=MIDDLE  ALT=\"%28%2430%2Fhr%29%28x%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > plus<BR>\n" );
document.write( "Bill= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%2420%2Fhr%29%28x%29 ALIGN=MIDDLE  ALT=\"%28%2420%2Fhr%29%28x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > equals<BR>\n" );
document.write( "Total=$470<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%28x%2B4%29%2B20%28x%29=470 ALIGN=MIDDLE  ALT=\"30%28x%2B4%29%2B20%28x%29=470\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30x%2B120%2B20x=470 ALIGN=MIDDLE  ALT=\"30x%2B120%2B20x=470\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50x=470-120 ALIGN=MIDDLE  ALT=\"50x=470-120\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50x=350 ALIGN=MIDDLE  ALT=\"50x=350\"   DISABLED_style= \"max-width:90%; height:auto;\" > ---> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cross%2850%29x%2Fcross%2850%29=cross%28350%297%2Fcross%2850%29 ALIGN=MIDDLE  ALT=\"cross%2850%29x%2Fcross%2850%29=cross%28350%297%2Fcross%2850%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=7hours ALIGN=MIDDLE  ALT=\"x=7hours\"   DISABLED_style= \"max-width:90%; height:auto;\" > ---------------> no. of hours Bill worked<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2B4=7%2B4=11hours ALIGN=MIDDLE  ALT=\"x%2B4=7%2B4=11hours\"   DISABLED_style= \"max-width:90%; height:auto;\" > --------> no. of hours Al worked<BR>\n" );
document.write( "In doubt? let's check;<BR>\n" );
document.write( "Al+Bill=$470<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2830%2A11%29%2B%2820%2A7%29=470 ALIGN=MIDDLE  ALT=\"%2830%2A11%29%2B%2820%2A7%29=470\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=330%2B140=470 ALIGN=MIDDLE  ALT=\"330%2B140=470\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=470=470 ALIGN=MIDDLE  ALT=\"470=470\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Thank you,<BR>\n" );
document.write( "Jojo<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );