document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=955093>Question 955093</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Are the lines through the pairs of points perpendicular:\r<BR>\n" );
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document.write( "!(10,1),B(-10,2) and C(10,-9), D(-6,3) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #583386 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=583386\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Slope of !B=(2-1)/(-10-10)=-1/20<BR>\n" );
document.write( "Slope of CD=(3-(-9))/-6-10=12/-16=-3/4<BR>\n" );
document.write( "Slopes of perpendicular lines are negative reciprocals.<BR>\n" );
document.write( "Lines are not perpendicular. </SPAN>\n" );
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