document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1199502>Question 1199502</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A riverboat travelling with the current can go 30 km in 1 hour, on the return trip against the current it took 1.5 hours to travel the 30 km. Which of the following would represent a linear system that could be used to determine the speed of the riverboat and the current where x is the speed of the riverboat and y is the speed of the current?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #833435 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</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=833435\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x, speed of boat in absence of a current<BR>\n" );
document.write( "y, the speed of river current<BR>\n" );
document.write( "Same distance each way\r<BR>\n" );
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document.write( "                      SPEED        TIME     DISTANCE(k.m.)\r\n" );
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document.write( "WITH CURRENT           x+y         1         30\r\n" );
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document.write( "AGAINST CURRENT        x-y         1.5       30\r\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=RATE%2ATIME=DISTANCE ALIGN=MIDDLE  ALT=\"RATE%2ATIME=DISTANCE\"   DISABLED_style= \"max-width:90%; height:auto;\" >---------basic rule\r<BR>\n" );
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document.write( "Notice time for \"with current\" is 1 hour...\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28x%2By=30%2C%283%2F2%29%28x-y%29=30%29 ALIGN=MIDDLE  ALT=\"system%28x%2By=30%2C%283%2F2%29%28x-y%29=30%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >------Or whatever is equivalent.\r<BR>\n" );
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document.write( "You might try,  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28x%2By=30%2C3%28x-y%29=60%29 ALIGN=MIDDLE  ALT=\"system%28x%2By=30%2C3%28x-y%29=60%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Better still,  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28x%2By=30%2Cx-y=20%29 ALIGN=MIDDLE  ALT=\"system%28x%2By=30%2Cx-y=20%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
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