document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=798950>Question 798950</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve system of equations by substitution<BR>\n" );
document.write( "4x+y=28 y=3x\r<BR>\n" );
document.write( "\n" );
document.write( "i know you change it to:<BR>\n" );
document.write( "y=-4x+28 y=3x\r<BR>\n" );
document.write( "\n" );
document.write( "but i am stuck from there... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #482419 by </B><A HREF=/tutors/aboutme.mpl?userid=Finavon><B>Finavon(81)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Finavon><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=482419\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 4x+y=28 (1)<BR>\n" );
document.write( "y=3x    (2)\r<BR>\n" );
document.write( "\n" );
document.write( "replace/substitute y in (1) with the value in (2)<BR>\n" );
document.write( "(1) becomes 4x + (3x) = 28<BR>\n" );
document.write( "adding the xs together gives<BR>\n" );
document.write( "7x = 28<BR>\n" );
document.write( "dividing both sides by 7 gives<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+7x%2F7+=+28%2F7+ ALIGN=MIDDLE  ALT=\"+7x%2F7+=+28%2F7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or x = 4<BR>\n" );
document.write( "enter this value in (2)<BR>\n" );
document.write( "y=3*4 = 12<BR>\n" );
document.write( "Check by putting both values in (1):<BR>\n" );
document.write( "4*4+12 = 16+12 = 28<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );