document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1047794>Question 1047794</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve system of equation by elimination:<BR>\n" );
document.write( "5b = 20 + 2a<BR>\n" );
document.write( "2a + 4b = 7<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #663318 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=663318\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 5b = 20 + 2a<BR>\n" );
document.write( "2a + 4b = 7<BR>\n" );
document.write( "move the a to the other side with b<BR>\n" );
document.write( "-2a+5b=20<BR>\n" );
document.write( "2a+4b=7<BR>\n" );
document.write( "If you add them, the a will disappear.  It isn't always this convenient, but here it is.<BR>\n" );
document.write( "9b=27<BR>\n" );
document.write( "b=3<BR>\n" );
document.write( "substitute in the first equation and 15=20+2a<BR>\n" );
document.write( "a=-2 1/2<BR>\n" );
document.write( "substitute into the second to check.<BR>\n" );
document.write( "-5+12=7<BR>\n" );
document.write( "that works<BR>\n" );
document.write( "a is -2 1/2<BR>\n" );
document.write( "b is 3 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );