document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=93896>Question 93896</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can somebody please help me?\r<BR>\n" );
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document.write( "Solve by substitution.<BR>\n" );
document.write( "8x-4y=16<BR>\n" );
document.write( "    y=2x-4\r<BR>\n" );
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document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #68424 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley75><B>checkley75(3666)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley75><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=68424\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Y=2X-4 NOW SUBSTITUTE (2X-4) FOR Y IN THE OTHER EQUATUION & SOLVE FOR X.<BR>\n" );
document.write( "8X-4(2X-4)=16<BR>\n" );
document.write( "8X-8X+16=16<BR>\n" );
document.write( "0X=16-16<BR>\n" );
document.write( "0=0<BR>\n" );
document.write( "THIS SAYS THE 2 EQUATIONS ARE IDENTICAL. 2 UNKNOWNS IN ONE EQUATION HAS NO UNIQUE SOLUTION.<BR>\n" );
document.write( "PROOF BY GRAPHING AS FOLLOWS:<BR>\n" );
document.write( "Y=2X-4 (RED LINE)<BR>\n" );
document.write( "8X-4Y=16 OR -4Y=-8X+16 OR Y=-8X/-4+16/-4 OR Y=2X-4 (GREEN LINE).<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+y+=+2x+-4%2C+y+=+2x+-4%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+y+=+2x+-4%2C+y+=+2x+-4%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = 2x -4 and y = 2x -4). <BR>\n" );
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