document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=916718>Question 916718</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The points (-4, -3), (1,4), (4, 2) and (-1, -5) are vertices of a quadrilateral. Use slopes to explain why the quadrilateral is a parallelogram. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #556232 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=556232\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hint:\r<BR>\n" );
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document.write( "Let's label the points A,B,C,D\r<BR>\n" );
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document.write( "A = (-4, -3)<BR>\n" );
document.write( "B = (1,4)<BR>\n" );
document.write( "C = (4, 2)<BR>\n" );
document.write( "D = (-1, -5)\r<BR>\n" );
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document.write( "If you can show that segment AB is parallel to segment CD\r<BR>\n" );
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document.write( "AND\r<BR>\n" );
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document.write( "If you can show that segment BC is parallel to segment AD\r<BR>\n" );
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document.write( "then ABCD is a parallelogram. Use the slope formula <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m+=+%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29 ALIGN=MIDDLE  ALT=\"m+=+%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > to calculate the slopes. </SPAN>\n" );
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