document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1173738>Question 1173738</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove that quadrilateral A(1,2), B(2,5), C(5,7), D(4,4) is a parallelogram by using slopes. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #799035 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13216)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=799035\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "The problem tells you what to do; do it.<br><BR>\n" );
document.write( "The quadrilateral is a parallelogram if both pairs of opposite sides are parallel.<br><BR>\n" );
document.write( "Find the slopes of AB and CD and show they are equal; then do the same for sides AD and BC.<br><BR>\n" );
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