document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=795297>Question 795297</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve each equation by using substitution <BR>\n" );
document.write( "a+b=20<BR>\n" );
document.write( "a-b=-4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #480874 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=480874\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a+b=20......1<BR>\n" );
document.write( "a-b=-4......2<BR>\n" );
document.write( "Convert Eq(2)<BR>\n" );
document.write( "a - b = - 4<BR>\n" );
document.write( "a = -4 + b<BR>\n" );
document.write( "Substitute into Eq(1)<BR>\n" );
document.write( "a + b = 20<BR>\n" );
document.write( "-4 + b + b = 20<BR>\n" );
document.write( "2b = 20 + 4<BR>\n" );
document.write( "2b = 24<BR>\n" );
document.write( "b = 12<BR>\n" );
document.write( "Substitute b = 12<BR>\n" );
document.write( "into Eq (1)<BR>\n" );
document.write( "a + b = 20<BR>\n" );
document.write( "a + 12 = 20<BR>\n" );
document.write( "a = 20 - 12<BR>\n" );
document.write( "a = 8.<BR>\n" );
document.write( "Hope this helps.<BR>\n" );
document.write( ";-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );