document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=768829>Question 768829</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If you are asked to show using slopes that the given four points, say A, B, C, D (with their corresponding coordinates),  are the vertices of a parallelogram, how would you do it? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #468517 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=468517\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If you are asked to show using slopes that the given four points, say A, B, C, D (with their corresponding coordinates), are the vertices of a parallelogram, how would you do it?<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Plot the points.<BR>\n" );
document.write( "Find slopes of opposite sides AB and CD<BR>\n" );
document.write( "If the slopes are the same AB and CD are parallel.<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "Find slopes of opposite sides AD and BC<BR>\n" );
document.write( "If the slopes are the same AD and BC are parallel.<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "If both pairs (above) are respectively parallel, ABCD is a parallelogram.<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "================  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );