document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=185395>Question 185395</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 3x+7y=21\r<BR>\n" );
document.write( "\n" );
document.write( "3x-3x+7y=3x+21\r<BR>\n" );
document.write( "\n" );
document.write( "7y/7=3x+21<BR>\n" );
document.write( "     -----<BR>\n" );
document.write( "     7<BR>\n" );
document.write( "3x/7+21/7<BR>\n" );
document.write( "3x/7+3 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #139098 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=139098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3x+7y=21<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Subtracting 3x from both sides:<BR>\n" );
document.write( "3x+7y-3x = -3x+21<BR>\n" );
document.write( "7y = -3x+21<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Now, dividing both sides by 7:<BR>\n" );
document.write( "y = (-3/7)x + 3   (this is what they're looking for)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "This is now in \"slope-intercept\" form:<BR>\n" );
document.write( "y = mx + b<BR>\n" );
document.write( "where<BR>\n" );
document.write( "m is slope<BR>\n" );
document.write( "b is the y-intercept at (0,b)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "So, from:<BR>\n" );
document.write( "y = (-3/7)x + 3<BR>\n" );
document.write( "m is -3/7<BR>\n" );
document.write( "b the y-intercept is at (0, 3)<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );