document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=239833>Question 239833</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve each system of equatioins by using substitution<BR>\n" );
document.write( "m+n=20 <BR>\n" );
document.write( "m-n=-4\r<BR>\n" );
document.write( "\n" );
document.write( "work: m+n=20<BR>\n" );
document.write( "       -n -n<BR>\n" );
document.write( "     ----------<BR>\n" );
document.write( "20-n<BR>\n" );
document.write( "         m-n=-4<BR>\n" );
document.write( "       20-n-n=-4<BR>\n" );
document.write( "       (20-n)=-4<BR>\n" );
document.write( "-4n-80<BR>\n" );
document.write( "~ thats all i could come up with.... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #175898 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=175898\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> m+n=20<BR>\n" );
document.write( "m=20-n<BR>\n" );
document.write( "Now replace m in the following equation with 20-n<BR>\n" );
document.write( "m-n=-4 <BR>\n" );
document.write( "(20-n)-n=-4<BR>\n" );
document.write( "-2n=-4-20<BR>\n" );
document.write( "-2n=-24<BR>\n" );
document.write( "n=-24/-2<BR>\n" );
document.write( "n=12 ans.<BR>\n" );
document.write( "m+12=20<BR>\n" );
document.write( "m=20-12<BR>\n" );
document.write( "m=8 ans.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );