document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=55065>Question 55065</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the system by graphing, addition and substitution methods.	3x +   y = &#8211;1,	9x + 3y = &#8211;3 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #37327 by </B><A HREF=/tutors/aboutme.mpl?userid=rchill><B>rchill(405)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rchill><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=37327\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If you add the two together, you get 12x+4y=-4, which reduces to 3x+y=-1.  Solving for y we get y=-3x-1.  Substituting that value of y into the first equation we get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3x-3x-1=-1 ALIGN=MIDDLE  ALT=\"3x-3x-1=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" > which reduces to -1=-1.  Because -1=-1 is a true statement, our answer is correct.  The graph of the two equations should be the same line because the 2nd equation reudces to y=-3x-1 also.  The graph is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28200%2C200%2C-5%2C5%2C-5%2C5%2C-3x-1%29 ALIGN=MIDDLE  ALT=\"graph%28200%2C200%2C-5%2C5%2C-5%2C5%2C-3x-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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