document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=16315>Question 16315</A>: <I><SPAN STYLE=\"word-break: break-all;\"> {2a+3b=12<BR>\n" );
document.write( "{5a-b=13             please help me ,,,,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 #8099 by </B><A HREF=/tutors/aboutme.mpl?userid=pwac><B>pwac(253)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=pwac><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=8099\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2a+3b=12-----(1)<BR>\n" );
document.write( "5a-b=13------(2)re-arrangeto get<BR>\n" );
document.write( "-b=13+5a<BR>\n" );
document.write( "b=-13-5a substitute b in(1)<BR>\n" );
document.write( "2a+3(-13-5a)=12 multiply bracket by 3<BR>\n" );
document.write( "2a-39-15a=12 sum a-terms and add 39 to both sides<BR>\n" );
document.write( "17a=51 divide both sides by 17<BR>\n" );
document.write( "a=3 substitute this value of a into (1)<BR>\n" );
document.write( "2(3)+3b=12<BR>\n" );
document.write( "6+3b=12 subtract 6 from both sides<BR>\n" );
document.write( "3b=6 divide both sides by3<BR>\n" );
document.write( "b=2<BR>\n" );
document.write( "a=3,b=2 substitute these into either equation to check<BR>\n" );
document.write( "Pete </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );