document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163906>Question 1163906</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Show by means of slopes that the four points (0,0), (-2,1), (3,4), and (5,3) are vertices of a parallelogram (a quadrilateral with opposite sides parallel).  </SPAN>\n" );
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document.write( "Show by means of slopes that the four points A(0,0), B(-2,1), C(3,4), and D(5,3) are vertices of a parallelogram.<br><BR>\n" );
document.write( "I much prefer a mental picture over the slope formula for determining slopes of lines....<br><BR>\n" );
document.write( "AB: from B to A is right 2, down 1<BR>\n" );
document.write( "CD: from C to D is right 2, down 1<BR>\n" );
document.write( "AB and CD are parallel<br><BR>\n" );
document.write( "BC: from B to C is right 5, up 3<BR>\n" );
document.write( "AD: from A to D is right 5, up 3<BR>\n" );
document.write( "BC and AD are parallel<br><BR>\n" );
document.write( "Pairs of opposite sides are parallel; ABCD is a parallelogram.<br><BR>\n" );
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