document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=129682>Question 129682</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help to solve this system using substitution\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=+%28-4%2F5%29+x-10 ALIGN=MIDDLE  ALT=\"y=+%28-4%2F5%29+x-10\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x+%2By+=20 ALIGN=MIDDLE  ALT=\"2x+%2By+=20\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #94669 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=94669\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2X+Y=20 OR Y=20-2X<BR>\n" );
document.write( "20-2X=(-4/5)X-10<BR>\n" );
document.write( "20-2X=-4X/5-10<BR>\n" );
document.write( "-2X+4X/5=-10-20<BR>\n" );
document.write( "(5*-2X+4X)/5=-30<BR>\n" );
document.write( "-10X+4X=-150<BR>\n" );
document.write( "-6X=-150<BR>\n" );
document.write( "X=-150/-6<BR>\n" );
document.write( "X=-25 ANSWER.<BR>\n" );
document.write( "Y=20-2*-25<BR>\n" );
document.write( "Y=20-50<BR>\n" );
document.write( "Y=-30 ANSWER.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "-30=(-4/5)*-25-10<BR>\n" );
document.write( "-30=100/5-10<BR>\n" );
document.write( "-30=-20-10<BR>\n" );
document.write( "-30=-30 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );