document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=851446>Question 851446</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine whether a quadrilateral with vertices A (5,7) B (1, -1) C (-6,-3) and D (-2,5) s a parallelogram. Use the slope formula.<BR>\n" );
document.write( "Please Note: My teacher did not give us much information on how to do this problem. I cannot find how to do it/ get the answer in our book. <BR>\n" );
document.write( "Thank You in Advance, Tutor!  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #512775 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39616)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=512775\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> SLOPE FORMULA<BR>\n" );
document.write( "Two points (r,s) and (u,v) in a plane have slope <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28v-s%29%2F%28u-r%29 ALIGN=MIDDLE  ALT=\"%28v-s%29%2F%28u-r%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Lines with equal slopes are parallel.  Opposite sides of a parallelogram are parallel; this occurs for both pair of opposite sides of a parallelogram.  This also means that opposite sides of a parallelogram have the same slope.\r<BR>\n" );
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document.write( "The instruction, \"Use the slope formula\", means find the slope for AB, BC, CD, and DA.  Now you can answer the question. </SPAN>\n" );
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