document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=775421>Question 775421</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve this equation using the substitution method <BR>\n" );
document.write( "x+y=20<BR>\n" );
document.write( "x-y=4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #472846 by </B><A HREF=/tutors/aboutme.mpl?userid=sofiyac><B>sofiyac(983)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sofiyac><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=sofiyac><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=472846\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> add y to each side of the equal sign of the second equation<BR>\n" );
document.write( "a) x=4+y now plug that into the first equation<BR>\n" );
document.write( "4+y+y=20<BR>\n" );
document.write( "4+2y=20 subtract 4 from each side<BR>\n" );
document.write( "2y=16 divide each side by 2<BR>\n" );
document.write( "y=8 now plug that into equation marked with a)<BR>\n" );
document.write( "x=4+8<BR>\n" );
document.write( "x=12<BR>\n" );
document.write( "so the solution is (12,8) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );