document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=61696>Question 61696</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0078213479/algebrahomeworkh>Alegbra Concepts and Applications</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Use substitution to solve for x and y\r<BR>\n" );
document.write( "\n" );
document.write( "4x - y = -7\r<BR>\n" );
document.write( "\n" );
document.write( "2x + 2y = 4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #42485 by </B><A HREF=/tutors/aboutme.mpl?userid=jai_kos><B>jai_kos(139)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jai_kos><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=42485\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Given    4x - y  = -7    --->(1)<BR>\n" );
document.write( "             2x + 2y = 4    --->(2)<BR>\n" );
document.write( "Divide equation(2) by 2, we get<BR>\n" );
document.write( "x + y  =  2<BR>\n" );
document.write( "x =  2 - y       --->(3)<BR>\n" );
document.write( "Substitue the  equation(3) in equation(1), we get...<BR>\n" );
document.write( "4(2-y) -y = -7<BR>\n" );
document.write( "8 - 4y -y = -7<BR>\n" );
document.write( "8 -5y = -7<BR>\n" );
document.write( "-5y = - 7 - 8<BR>\n" );
document.write( "-5y = -15<BR>\n" );
document.write( "y = -15/ - 5<BR>\n" );
document.write( "y = 3  --->(4)<BR>\n" );
document.write( "Now substitue the value of y =3 in eqution(3), we get<BR>\n" );
document.write( "x = 2 - 3 = -1<BR>\n" );
document.write( "x =-1<BR>\n" );
document.write( "Therefore we have the  x =-1 and y = 3<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );