document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=74540>Question 74540</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Are the following lines parallel, perpendicular, or neither?<BR>\n" );
document.write( "   L1 with equation x – 7y = 21<BR>\n" );
document.write( "   L2 with equation 7x + y = 7<BR>\n" );
document.write( "A)	Parallel<BR>\n" );
document.write( "B)	Perpendicular<BR>\n" );
document.write( "C)	Neither<BR>\n" );
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 #53516 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=53516\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> X-7Y=21, -7Y=-X+21, Y=-X/-7+21/-7, Y=X/7-3<BR>\n" );
document.write( "7X+Y=7, Y=-7X+7<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+200%2C+200%2C+-6%2C+5%2C+-6%2C+5%2C+y+=+x%2F7+-3%2C+y+=+-7x+%2B7%29+ ALIGN=MIDDLE  ALT=\"+graph%28+200%2C+200%2C+-6%2C+5%2C+-6%2C+5%2C+y+=+x%2F7+-3%2C+y+=+-7x+%2B7%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > (graph 200x200 pixels, x from -6 to 5, y from -6 to 5, of TWO functions y = x/7 -3 and y = -7x +7). <BR>\n" );
document.write( "they look perpendicular to me AND the slopes are negative recipricals of each other. (definition of parallel lines).    </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );