document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=451720>Question 451720</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How can I determine if two lines are perendicular?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #310731 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=310731\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Show that the angle in between these lines is 90 degrees. Or show that the slopes are negative reciprocals of each other. Or if your lines are vectors, show that the dot product is equal to 0. Quite a few ways to prove this. </SPAN>\n" );
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