document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=941291>Question 941291</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Using the Substitution method, how would you solve x-y=12 and x+y=20?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #573769 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=573769\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x-y=12<BR>\n" );
document.write( "x+y=20<BR>\n" );
document.write( "---<BR>\n" );
document.write( "put the system of linear equations into standard form<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x-y=12<BR>\n" );
document.write( "x+y=20<BR>\n" );
document.write( "---<BR>\n" );
document.write( "copy and paste the above standard form linear equations in to this solver:<BR>\n" );
document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "solution:<BR>\n" );
document.write( "x = 16<BR>\n" );
document.write( "y = 4<BR>\n" );
document.write( "---<BR>\n" );
document.write( "now by substitution:<BR>\n" );
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document.write( "y = 20 - x<BR>\n" );
document.write( "x - y = 12<BR>\n" );
document.write( "x - (20 - x) = 12<BR>\n" );
document.write( "x - 20 + x = 12<BR>\n" );
document.write( "2x = 12 + 20<BR>\n" );
document.write( "x = (12 + 20)/2<BR>\n" );
document.write( "x = 16<BR>\n" );
document.write( "y = 20 - 16<BR>\n" );
document.write( "y = 4<BR>\n" );
document.write( "---<BR>\n" );
document.write( "solution by substitution:<BR>\n" );
document.write( "x = 16<BR>\n" );
document.write( "y = 4<BR>\n" );
document.write( "---<BR>\n" );
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document.write( "https://sooeet.com/chat.php?gn=algebra<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve quadratic equations with quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve systems of linear equations up to 6-equations 6-variables:<BR>\n" );
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document.write( "--- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );