document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=70930>Question 70930</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can you please help me with these simultaneous equations. I don't understand what I have to do. Thank you.<BR>\n" );
document.write( "2x + y = 21<BR>\n" );
document.write( "x - y = 6\r<BR>\n" );
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document.write( "and\r<BR>\n" );
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document.write( "u + v = 8<BR>\n" );
document.write( "4u - v = 17 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #50671 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley75><B>checkley75(3666)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley75><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=50671\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> X-Y=6 NOW FIND THE VALUE OF X OT Y THUS<BR>\n" );
document.write( "X=Y+6 NOW SUBSTITUTE (Y+6) FOR X IN THE OTHERE EQUATION THUS:<BR>\n" );
document.write( "2(Y+6)+Y=21 NOW SOLVE FOR Y<BR>\n" );
document.write( "2Y+12+Y=21<BR>\n" );
document.write( "3Y=21-12<BR>\n" );
document.write( "3Y=9<BR>\n" );
document.write( "Y=9/3<BR>\n" );
document.write( "Y=3 ANSWER FOR X NOW REPLACE  X BY 3 AND SOLVE FOR Y IN EITHER EQUATION<BR>\n" );
document.write( "2X+3=21<BR>\n" );
document.write( "2X=21-3<BR>\n" );
document.write( "2X=18<BR>\n" );
document.write( "X=18/2<BR>\n" );
document.write( "X=9 ANSWER<BR>\n" );
document.write( "PROOF<BR>\n" );
document.write( "9-3=6<BR>\n" );
document.write( "6=6<BR>\n" );
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document.write( "U+V=8<BR>\n" );
document.write( "U=8-V NOW SUBSTITUTE (8-V ) FOR U<BR>\n" );
document.write( "4(8-V)-V=17<BR>\n" );
document.write( "32-4V-V=17<BR>\n" );
document.write( "-4V-V=17-32<BR>\n" );
document.write( "-5V=15<BR>\n" );
document.write( "V=15/-5<BR>\n" );
document.write( "V=-3 ANSWER NOW SUBSTITUTE -3 FOR V & SOLVE FOR U<BR>\n" );
document.write( "U+3=8<BR>\n" );
document.write( "U=8-3<BR>\n" );
document.write( "U=5 ANSWER<BR>\n" );
document.write( "PROOF<BR>\n" );
document.write( "4*5+(-3)=17<BR>\n" );
document.write( "20-3=17<BR>\n" );
document.write( "17=17\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );