document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1098542>Question 1098542</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2x-y -1<BR>\n" );
document.write( "7x+6y=-6\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 #712940 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</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=712940\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br>While the solution by the other tutor is fine, I don't understand why so many people use substitution to solve pairs of equations that are given in this form, when elimination seems to me so much easier.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x-y+=1 ALIGN=MIDDLE  ALT=\"2x-y+=1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7x%2B6y=-6 ALIGN=MIDDLE  ALT=\"7x%2B6y=-6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "multiply the first equation by 6 so that the y term is \"-6y\"; then when you add the two equations the y is eliminated, giving you a simple equation to solve for x:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12x-6y+=+6 ALIGN=MIDDLE  ALT=\"12x-6y+=+6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7x%2B6y+=+-6 ALIGN=MIDDLE  ALT=\"7x%2B6y+=+-6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=19x+=+0 ALIGN=MIDDLE  ALT=\"19x+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" >   [adding the two equations]<BR>\n" );
document.write( "So x = 0; now substitute that value in either of the original equations.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%280%29-y+=+1 ALIGN=MIDDLE  ALT=\"2%280%29-y+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-y+=+1 ALIGN=MIDDLE  ALT=\"-y+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and so y = -1.<br><BR>\n" );
document.write( "The solution is (x,y) = (0,-1). </SPAN>\n" );
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