document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=65155>Question 65155</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm really confused with the process that I'm supposed to follow.  I am finding it difficult to even know where to start.<BR>\n" );
document.write( "The first problem is:<BR>\n" );
document.write( "-x+y=2<BR>\n" );
document.write( "_______<BR>\n" );
document.write( " x+y=4<BR>\n" );
document.write( "The only thing I know for sure is that I'm supposed to use the substitution method but what am I substituting, with what and why.<BR>\n" );
document.write( "I really do appreciate whatever help you can give me.<BR>\n" );
document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #45642 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=45642\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -x+y=2<BR>\n" );
document.write( "_______<BR>\n" );
document.write( "x+y=4<BR>\n" );
document.write( "The only thing I know for sure is that I'm supposed to use the substitution method but what am I substituting, with what and why.<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "It's like saying \"my brother is 2 years older than I am\".<BR>\n" );
document.write( "If the person knows how old you are they can figure out<BR>\n" );
document.write( "how old your brother is.<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "So you solve one of the equations for one of the variables:<BR>\n" );
document.write( "If x+y=4 then x=4-y<BR>\n" );
document.write( "Now we know how y is related to x.<BR>\n" );
document.write( "So, inplace of x in the other equation we put what x is equal to, as follows:<BR>\n" );
document.write( "-(4-y)+y=2<BR>\n" );
document.write( "Then we can figure out what Y is, as follows:<BR>\n" );
document.write( "-4+y+y=2<BR>\n" );
document.write( "-4+2y=2<BR>\n" );
document.write( "2y=6<BR>\n" );
document.write( "y=3<BR>\n" );
document.write( "Now we know what y equals, so substitute back and find out what x is:<BR>\n" );
document.write( "If x=4-y then x=4-3=1<BR>\n" );
document.write( "Now we know that x=1 and y=3<BR>\n" );
document.write( "Tha's it; you've found the value of both variables for these two equations:<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );