document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=996067>Question 996067</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a canoeist travels 4 miles downstream in 1 hour. the return trip takes 1.5 hours.Write the equations to solve the problem. what's the rate of the boat in still water </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #614691 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=614691\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A traveler travels <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > miles downstream in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bd%5D ALIGN=MIDDLE  ALT=\"t%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > hour. the return trip takes <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bu%5D ALIGN=MIDDLE  ALT=\"t%5Bu%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours.Write the equations to solve the problem. what's the rate of the boat in still water?\r<BR>\n" );
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document.write( "Let c be the rate of the current; r is the rate for the boat if no current.\r\n" );
document.write( "The use of the subscripts are d for DOWNSTREAM and u for UPSTREAM.\r\n" );
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document.write( "             speed       time       distance\r\n" );
document.write( "TO           r+c        <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bd%5D ALIGN=MIDDLE  ALT=\"t%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >        d\r\n" );
document.write( "FROM         r-c        <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bu%5D ALIGN=MIDDLE  ALT=\"t%5Bu%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >        d\r\n" );
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document.write( "Note that the unknown variables in the problem description are r and c.\r\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28%28r%2Bc%29%2At%5Bd%5D=d%2C%28r-c%29%2At%5Bu%5D=d%29 ALIGN=MIDDLE  ALT=\"system%28%28r%2Bc%29%2At%5Bd%5D=d%2C%28r-c%29%2At%5Bu%5D=d%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, the starting system of equations.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%2At%5Bd%5D%2Bc%2At%5Bd%5D=d ALIGN=MIDDLE  ALT=\"r%2At%5Bd%5D%2Bc%2At%5Bd%5D=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%2At%5Bd%5D=d-r%2At%5Bd%5D ALIGN=MIDDLE  ALT=\"c%2At%5Bd%5D=d-r%2At%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c=%28d-rt%5Bd%5D%29%2Ft%5Bd%5D ALIGN=MIDDLE  ALT=\"c=%28d-rt%5Bd%5D%29%2Ft%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5D-ct%5Bu%5D=d ALIGN=MIDDLE  ALT=\"rt%5Bu%5D-ct%5Bu%5D=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5D-%28%28d-rt%5Bd%5D%29%2Ft%5Bd%5D%29t%5Bu%5D=d ALIGN=MIDDLE  ALT=\"rt%5Bu%5D-%28%28d-rt%5Bd%5D%29%2Ft%5Bd%5D%29t%5Bu%5D=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5D%2At%5Bd%5D-%28d-rt%5Bd%5D%29t%5Bu%5D=d%2At%5Bd%5D ALIGN=MIDDLE  ALT=\"rt%5Bu%5D%2At%5Bd%5D-%28d-rt%5Bd%5D%29t%5Bu%5D=d%2At%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5D%2At%5Bd%5D-d%2At%5Bu%5D%2Brt%5Bd%5Dt%5Bu%5D=d%2At%5Bd%5D ALIGN=MIDDLE  ALT=\"rt%5Bu%5D%2At%5Bd%5D-d%2At%5Bu%5D%2Brt%5Bd%5Dt%5Bu%5D=d%2At%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5Dt%5Bd%5D%2Brt%5Bd%5Dt%5Bu%5D-dt%5Bu%5D=dt%5Bd%5D ALIGN=MIDDLE  ALT=\"rt%5Bu%5Dt%5Bd%5D%2Brt%5Bd%5Dt%5Bu%5D-dt%5Bu%5D=dt%5Bd%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%5Bu%5Dt%5Bd%5D%2Brt%5Bu%5Dt%5Bd%5D=dt%5Bd%5D%2Bdt%5Bu%5D ALIGN=MIDDLE  ALT=\"rt%5Bu%5Dt%5Bd%5D%2Brt%5Bu%5Dt%5Bd%5D=dt%5Bd%5D%2Bdt%5Bu%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%282t%5Bu%5Dt%5Bd%5D%29=dt%5Bd%5D%2Bdt%5Bu%5D ALIGN=MIDDLE  ALT=\"r%282t%5Bu%5Dt%5Bd%5D%29=dt%5Bd%5D%2Bdt%5Bu%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r=%28dt%5Bd%5D%2Bdt%5Bu%5D%29%2F%282t%5Bu%5Dt%5Bd%5D%29%29 ALIGN=MIDDLE  ALT=\"highlight%28r=%28dt%5Bd%5D%2Bdt%5Bu%5D%29%2F%282t%5Bu%5Dt%5Bd%5D%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >------answer in symbolic form. </SPAN>\n" );
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