document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=146817>Question 146817</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321067142/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> USe slopes to show that the square with vertices at (-2,5), (4,5), (4,-1) and <BR>\n" );
document.write( "(-2,-1) has diagonals that 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 #107220 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=107220\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Opposite corners are (-2,5) and (4,-1),<BR>\n" );
document.write( "and (-2,-1) and (4,5). <BR>\n" );
document.write( "Find the slope m of the lines connecting opposite corners.<BR>\n" );
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document.write( "(-2,5) and (4,-1)<BR>\n" );
document.write( "m1 = (y2-y1)/(x2-x1)<BR>\n" );
document.write( "m1 = (-1-5)/(4+2)<BR>\n" );
document.write( "m1 = -6/6 = -1<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "(-2,-1) and (4,5)<BR>\n" );
document.write( "m2 = (5 - (-1))/(4 -(-2))<BR>\n" );
document.write( "m2 = 6/6 = +1<BR>\n" );
document.write( "Since the slopes are negative inverses, they're perpendicular. </SPAN>\n" );
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