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 #53520 by </B><A HREF=/tutors/aboutme.mpl?userid=Cintchr><B>Cintchr(481)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cintchr><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=53520\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve each equation so that they are in the form y=mx+b<BR>\n" );
document.write( "L1 : <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+%96+7y+=+21+ ALIGN=MIDDLE  ALT=\"+x+%96+7y+=+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-7y+=+-x+%2B+21+ ALIGN=MIDDLE  ALT=\"-7y+=+-x+%2B+21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+%281%2F7%29x+-+3+ ALIGN=MIDDLE  ALT=\"+y+=+%281%2F7%29x+-+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "m = 1/7\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "L2 : <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+7x+%2B+y+=+7+ ALIGN=MIDDLE  ALT=\"+7x+%2B+y+=+7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+-7x+%2B7+ ALIGN=MIDDLE  ALT=\"+y+=+-7x+%2B7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "m=-7\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "since the slopes are opposite reciprocals of one another, the lines are perpendicular to one another. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );