document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1190677>Question 1190677</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2x+y=-4<BR>\n" );
document.write( "x+y=-7<BR>\n" );
document.write( "Find the first variable and isolate it. Then solve for that variable.<BR>\n" );
document.write( "solve for the second variable <BR>\n" );
document.write( "find the numerical value of the first variable.<BR>\n" );
document.write( "(when I say the first variable it's any variable that you would want to start with...that's what my teacher said)<BR>\n" );
document.write( "I don't really understand how to do this so could somebody please explain  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #822372 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=822372\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Same problem, different numbers.<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "2x+y=5<BR>\n" );
document.write( "2y=2x-8 ---> y = x-4<BR>\n" );
document.write( "Find the first variable (that you want to use) and isolate it then solve for it<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "y is isolated and solved for in terms of x.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "2x+y=5<BR>\n" );
document.write( "Sub for y<BR>\n" );
document.write( "2x + (x-4) = 5<BR>\n" );
document.write( "3x - 4 = 5<BR>\n" );
document.write( "3x = 9<BR>\n" );
document.write( "x = 3<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "y = x-4<BR>\n" );
document.write( "y = -1<BR>\n" );
document.write( "That's solved by substitution.<BR>\n" );
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document.write( "Another way is elimination:<BR>\n" );
document.write( "2x+y=5<BR>\n" );
document.write( "2y=2x-8<BR>\n" );
document.write( "----<BR>\n" );
document.write( "2x +y = 5<BR>\n" );
document.write( "2x-2y = 8<BR>\n" );
document.write( "-------------- Subtract<BR>\n" );
document.write( "3y = -3<BR>\n" );
document.write( "y = -1<BR>\n" );
document.write( "---<BR>\n" );
document.write( "2x +y = 5<BR>\n" );
document.write( "2x - 1 = 5<BR>\n" );
document.write( "2x = 6<BR>\n" );
document.write( "x = 3<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );