document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=181999>Question 181999</A>: <I><SPAN STYLE=\"word-break: break-all;\"> x+y=3 and 3x-4y=-19<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #136617 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=136617\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x+y=3 <BR>\n" );
document.write( "x=3-y now replace x with (3-y) in the other equation.<BR>\n" );
document.write( "3x-4y=-19<BR>\n" );
document.write( "3(3-y)-4y=-19<BR>\n" );
document.write( "9-3y-4y=-19<BR>\n" );
document.write( "-7y=-19-9<BR>\n" );
document.write( "-7y=-28<BR>\n" );
document.write( "y=-28/-7<BR>\n" );
document.write( "y=4 ans.<BR>\n" );
document.write( "x+4=3<BR>\n" );
document.write( "x=3-4<BR>\n" );
document.write( "x=-1 ans.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "3*-1-4*4=-19<BR>\n" );
document.write( "-3-16=-19<BR>\n" );
document.write( "-19=-19<BR>\n" );
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