document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1000520>Question 1000520</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ship A has position vector (9 i + 3 j) km. Relative to an observer on a second ship B, ship A has position vector (&#8722;9 i &#8722; 2 j) km.\r<BR>\n" );
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document.write( "What is the position vector of ship B?\r<BR>\n" );
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document.write( "I had -18i -5j\r<BR>\n" );
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document.write( "However, both values are not correct\r<BR>\n" );
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document.write( "THANK YOU  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #617978 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><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=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=617978\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \"Ship A has position vector (9 i + 3 j) km\" means that the map of whoever maps ships and assigns ship positions looks like this<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28400%2C300%2C-2%2C13.3%2C-2%2C8%2C%0D%0Agrid%281%29%2Cred%28line%2810.2%2C5%2C10.2%2C7.5%29%29%2C%0D%0Ared%28arrow%2810.2%2C5%2C10.2%2C7.5%29%29%2Clocate%2810.5%2C7.8%2Cred%28N%29%29%2C%0D%0Ablue%28arc%289%2C3%2C0.8%2C0.2%2C0%2C360%29%29%2Cblue%28arc%289%2C3%2C0.6%2C0.1%2C0%2C360%29%29%2C%0D%0Alocate%289%2C2.7%2Cblue%28ship%29%29%2Clocate%2810.4%2C2.7%2Cblue%28A%29%29%2C%0D%0Ablue%28line%280%2C0%2C9%2C3%29%29%2Cblue%28arrow%286%2C2%2C8.7%2C2.9%29%29%2C%0D%0Alocate%284.5%2C1.5%2Cblue%28position%29%29%2Clocate%287%2C1.5%2Cblue%28vector%29%29%0D%0A%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(I am assuming that for assigning position vectors, the y-axis (or j-axis) points North,<BR>\n" );
document.write( "and that applies to the absolute position of a ship,<BR>\n" );
document.write( "and to its position relative to another ship).<BR>\n" );
document.write( "\"Relative to an observer on a second ship B, ship A has position vector (-9i-2j) km\" means that the map with both ships looks like this<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28600%2C225%2C-2%2C22%2C-2%2C7%2C%0D%0Agrid%281%29%2Cred%28line%2820.2%2C4%2C20.2%2C6.5%29%29%2C%0D%0Ared%28arrow%2820.2%2C4%2C20.2%2C6.5%29%29%2Clocate%2820.5%2C7%2Cred%28N%29%29%2C%0D%0Ablue%28arc%289%2C3%2C0.8%2C0.2%2C0%2C360%29%29%2Cblue%28arc%289%2C3%2C0.6%2C0.1%2C0%2C360%29%29%2C%0D%0Alocate%289%2C2.7%2Cblue%28ship%29%29%2Clocate%2810.4%2C2.7%2Cblue%28A%29%29%2C%0D%0Ablue%28line%280%2C0%2C9%2C3%29%29%2Cblue%28arrow%286%2C2%2C8.7%2C2.9%29%29%2C%0D%0Ared%28arc%2818%2C5%2C0.8%2C0.2%2C0%2C360%29%29%2Cred%28arc%2818%2C5%2C0.6%2C0.1%2C0%2C360%29%29%2C%0D%0Alocate%2818%2C4.7%2Cred%28ship%29%29%2Clocate%2819.5%2C4.7%2Cred%28B%29%29%2C%0D%0Ared%28line%2818%2C5%2C9.2%2C3.1%29%29%2Cred%28arrow%2813.5%2C4%2C9.2%2C3.1%29%29%2C%0D%0Alocate%284.5%2C1.5%2Cblue%28%289i%2B3j%29%29%29%2Clocate%2813.5%2C4%2Cred%28%28-9i-2j%29%29%29%0D%0A%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The absolute position vector for ship B would be<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=blue%28%289i%2B3j%29%29-red%28%28-9i-2j%29%29=highlight%28%2818i%2B5j%29%29 ALIGN=MIDDLE  ALT=\"blue%28%289i%2B3j%29%29-red%28%28-9i-2j%29%29=highlight%28%2818i%2B5j%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );