document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1155473>Question 1155473</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the system by Substitution:<BR>\n" );
document.write( "3x + 3 = 5y<BR>\n" );
document.write( "4x + 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 #778061 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13209)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=778061\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "I would never solve a system of equations like this using substitution; elimination is far easier.<br><BR>\n" );
document.write( "However, if I did solve it using substitution, I would not solve for y and get an expression involving fractions and then substitute in the other equation.<br><BR>\n" );
document.write( "Remember that, using substitution, you don't need to solve for y or x -- you can solve for 3y, or 7x, or whatever is convenient.<br><BR>\n" );
document.write( "So here is how I would solve this using substitution.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3x%2B3+=+5y ALIGN=MIDDLE  ALT=\"3x%2B3+=+5y\"   DISABLED_style= \"max-width:90%; height:auto;\" > --> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6x%2B6+=+10y ALIGN=MIDDLE  ALT=\"6x%2B6+=+10y\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4x%2B2y=-4 ALIGN=MIDDLE  ALT=\"4x%2B2y=-4\"   DISABLED_style= \"max-width:90%; height:auto;\" > --> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20x%2B10y+=+-20 ALIGN=MIDDLE  ALT=\"20x%2B10y+=+-20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Now substitute \"6x+6\" for \"10y\" in the second equation:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20x%2B%286x%2B6%29+=+-20 ALIGN=MIDDLE  ALT=\"20x%2B%286x%2B6%29+=+-20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=26x%2B6+=+-20 ALIGN=MIDDLE  ALT=\"26x%2B6+=+-20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=26x+=+26 ALIGN=MIDDLE  ALT=\"26x+=+26\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+1 ALIGN=MIDDLE  ALT=\"x+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Then finish from there by any method you choose.<br>\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );