document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=333867>Question 333867</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve by graphing, and then check your ordered pair in both equations by 'plugging it in' to confirm that it is a solution to the system:<BR>\n" );
document.write( "x+y= -1<BR>\n" );
document.write( "2x-y=4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239280 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=239280\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x+y= -1<BR>\n" );
document.write( "y=-x-1 red line<BR>\n" );
document.write( "2x-y=4<BR>\n" );
document.write( "-y=-2x+4<BR>\n" );
document.write( "y=2x-4 green line<BR>\n" );
document.write( "Create a graph by saying <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-x+-1%2C+2x+-4%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-x+-1%2C+2x+-4%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -x -1 and 2x -4). <BR>\n" );
document.write( "Solution (1,-2).<BR>\n" );
document.write( "Proofs:<BR>\n" );
document.write( "-2=-1-1<BR>\n" );
document.write( "-2=-2 <BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "-2=2*1-4<BR>\n" );
document.write( "-2=2-4<BR>\n" );
document.write( "-2=-2 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );