document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=678444>Question 678444</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How can I show that two line segments whose endpoints are (8,0) (6,6) and (5,7), and (8,-5) are perpendicular? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #421397 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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=421397\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find slopes of each line segment, the slopes should be negative reciprocals.<BR>\n" );
document.write( "For example, if a line has a slope of 2, the perpendicular line will have slope of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1%2F2 ALIGN=MIDDLE  ALT=\"-1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Use endpoints to find the slope of the line<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28y1-y2%29%2F%28x1-x2%29+=+slope ALIGN=MIDDLE  ALT=\"%28y1-y2%29%2F%28x1-x2%29+=+slope\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "(8,0)(6,6)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%280-6%29%2F%288-6%29+=+-6%2F2+=+-3 ALIGN=MIDDLE  ALT=\"%280-6%29%2F%288-6%29+=+-6%2F2+=+-3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "(5,7)(8,-5)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%287--5%29%2F%285-8%29+=+12%2F-3+=+-4 ALIGN=MIDDLE  ALT=\"%287--5%29%2F%285-8%29+=+12%2F-3+=+-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "The lines are neither perpendicular nor parallel, they don't have negative reciprocal slopes nor do they even have the same slope.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Perhaps indicate which endpoints correspond with each line segment.<BR>\n" );
document.write( ".....................<BR>\n" );
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