document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1129802>Question 1129802</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove that the points A(-2,-3), B(6,2), C(8,7) and D(0,2) are the vertices of a parallelogram. </SPAN>\n" );
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document.write( "Slope of AB:  (2-(-3)) / (6-(-2)) = 5/8<BR>\n" );
document.write( "Slope of CD:  (2-7) / (0 - 8) = -5/-8 = 5/8<br><BR>\n" );
document.write( "So AB is parallel to CD<br>\r<BR>\n" );
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document.write( "Slope of AD:  (2-(-3)) / (0-(-2)) = 5/2<BR>\n" );
document.write( "Slope of BC:  (7-2) / (8-6) = 5/2<BR>\n" );
document.write( "So AD is parellel to BC<br>\r<BR>\n" );
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document.write( "Since AB || CD and AD || BC, ABCD forms a parallelogram. &#8718;\r<BR>\n" );
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document.write( " </SPAN>\n" );
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