document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1127887>Question 1127887</A>: <I><SPAN STYLE=\"word-break: break-all;\"> [Quadrilateral] If the oppisite sides of a quadrilateral are use parallel, then it is a parallelogram. Use slopes to determine wheather the points (-6,1),(-2,-1),(0,3), and (4,1) are the vertices of 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 #744355 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=744355\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A( -6,1 )<BR>\n" );
document.write( "B( -2,-1 )<BR>\n" );
document.write( "C( 0,3 )<BR>\n" );
document.write( "D( 4,1 )<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "slope AB = ( 1 -(-1) ) / ( -6 -(-2) )<BR>\n" );
document.write( "slope AB = 2/(-4) <BR>\n" );
document.write( "slope AB = -1/2<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "slope BC = ( 3 -(-1) ) / ( 0 -(-2) )<BR>\n" );
document.write( "slope BC = 4/2<BR>\n" );
document.write( "slope BC = 2<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "slope AC = ( 3 - 1 ) / ( 0 -(-6)<BR>\n" );
document.write( "slope AC = 2/6 <BR>\n" );
document.write( "slope AC = 1/3<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "slope BD = ( 1 -(-1) ) / ( 4 -(-2) )<BR>\n" );
document.write( "slope BD = 2/6 <BR>\n" );
document.write( "slope BD = 1/3<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "slope AD = ( 1 - 1 ) / ( 4 -(-6)<BR>\n" );
document.write( "slope AD = 0<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "slope CD = ( 1 - 3 ) / ( 4 - 0 )<BR>\n" );
document.write( "slope CD = -2 / 4 <BR>\n" );
document.write( "slope CD = -1/2<BR>\n" );
document.write( "----------------------<BR>\n" );
document.write( "There are 1 pair of parallel lines with slope = -1/2<BR>\n" );
document.write( "Also, there are 1 pair of parallel lines with slope = 1/3<BR>\n" );
document.write( "So it is a parallelogram, and the lines BC and AD<BR>\n" );
document.write( "must be the diagonals\r<BR>\n" );
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document.write( " </SPAN>\n" );
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