document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=624841>Question 624841</A>: <I><SPAN STYLE=\"word-break: break-all;\"> method of usbstitution<BR>\n" );
document.write( "1:a=5-2b<BR>\n" );
document.write( "5a+2b=1 <BR>\n" );
document.write( "2: 2m+n=0<BR>\n" );
document.write( "m+2n=3 <BR>\n" );
document.write( "3: x+y=4<BR>\n" );
document.write( "2x-y=5<BR>\n" );
document.write( "4: y-2x=1<BR>\n" );
document.write( "3x-4y=1<BR>\n" );
document.write( "5: a-2b=9<BR>\n" );
document.write( "2a+3b=4<BR>\n" );
document.write( "6: x+2y=7<BR>\n" );
document.write( "3x-2y=3<BR>\n" );
document.write( "7: 2a+b=9<BR>\n" );
document.write( "3a-2b=11 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #393104 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=393104\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> method of usbstitution<BR>\n" );
document.write( "1:a=5-2b<BR>\n" );
document.write( "5a+2b=1<BR>\n" );
document.write( "Sub for a in the 2nd eqn<BR>\n" );
document.write( "5(5-2b) + 2b = 1<BR>\n" );
document.write( "25-10b + 2b = 1<BR>\n" );
document.write( "-8b = -24<BR>\n" );
document.write( "b = 3<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "a = 5-2b<BR>\n" );
document.write( "a = -1<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "2: 2m+n=0<BR>\n" );
document.write( "m+2n=3<BR>\n" );
document.write( "Solve either eqn for either m or n:<BR>\n" );
document.write( "m+2n=3 --> m = 3-2n<BR>\n" );
document.write( "Then it's the same as #1<BR>\n" );
document.write( "========================<BR>\n" );
document.write( "3 to 7 are the same as #2<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "3: x+y=4<BR>\n" );
document.write( "2x-y=5<BR>\n" );
document.write( "4: y-2x=1<BR>\n" );
document.write( "3x-4y=1<BR>\n" );
document.write( "5: a-2b=9<BR>\n" );
document.write( "2a+3b=4<BR>\n" );
document.write( "6: x+2y=7<BR>\n" );
document.write( "3x-2y=3<BR>\n" );
document.write( "7: 2a+b=9<BR>\n" );
document.write( "3a-2b=11 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );