document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334822>Question 334822</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help solve this system by substitution method.\r<BR>\n" );
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document.write( "y = -4x - 7<BR>\n" );
document.write( "y = 3x\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239905 by </B><A HREF=/tutors/aboutme.mpl?userid=janakisubramanian><B>janakisubramanian(2)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=janakisubramanian><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=239905\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y = -4x - 7 ---------(1)<BR>\n" );
document.write( "y = 3x \r<BR>\n" );
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document.write( "Solution:<BR>\n" );
document.write( "Substitute y = 3x in the first equation.<BR>\n" );
document.write( "So, 3x = - 4x - 7<BR>\n" );
document.write( "==> 3x + 4x = -7 {transposing -4x to LHS)<BR>\n" );
document.write( "==> 7x = -7<BR>\n" );
document.write( "==> x = -7/7<BR>\n" );
document.write( "==> x = -1<BR>\n" );
document.write( "So now y = 3x<BR>\n" );
document.write( "         = 3 (-1)<BR>\n" );
document.write( "         = -3<BR>\n" );
document.write( "Thus x = -1 and y = -3. </SPAN>\n" );
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