document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=727799>Question 727799</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help and thank you, also pls show solution to the problem,<BR>\n" );
document.write( "3a-3b=-15<BR>\n" );
document.write( "-3a-3b=-3<BR>\n" );
document.write( "a=?<BR>\n" );
document.write( "b=? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #447007 by </B><A HREF=/tutors/aboutme.mpl?userid=hoomanc><B>hoomanc(14)</B></A><img src=\"/images/stars/stars-06.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=hoomanc><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=447007\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  ok.  just a simple explanation, assume,<BR>\n" );
document.write( "D= -15  &  N=-3 , you agree that D+N=-15-3=-18<BR>\n" );
document.write( "it's exactly like that,  sum the two equation with each other:\r<BR>\n" );
document.write( "\n" );
document.write( "D    >>>   3a-3b=-15<BR>\n" );
document.write( "N    >>>   -3a-3b=-3<BR>\n" );
document.write( "D+N >>>    (3a-3a)+(-3b-3b)=-18<BR>\n" );
document.write( "D+N >>>    (-6b)=-18    >>>\r<BR>\n" );
document.write( "\n" );
document.write( "b=3   >>>\r<BR>\n" );
document.write( "\n" );
document.write( " (D  >>>   3a-3*3=-15 >>>  3a =-15+9 =-6 )\r<BR>\n" );
document.write( "\n" );
document.write( "a=-2 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );