document.write( "Question 1068973: Show that the points A(5,-1),B(2,-5),C(7,-5)and D(10,-1)are the vertices of parallelogram. \n" ); document.write( "

Algebra.Com's Answer #684207 by Edwin McCravy(20055) $\"\"$ $\"About$

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document.write( "The slope formula is:\r\n" );
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document.write( "1. Use the slope formula the find the slope of AB.\r\n" );
document.write( "2. Use the slope formula the find the slope of CD.\r\n" );
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document.write( "Those should be equal (4/3) which shows that AB is parallel to CD.\r\n" );
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document.write( "3. Use the slope formula the find the slope of AD.\r\n" );
document.write( "4. Use the slope formula the find the slope of BC.\r\n" );
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document.write( "Those should be equal (0) which shows that AD is parallel to BC.\r\n" );
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document.write( "A quadrilateral with opposite sides parallel is a parallelogram.\r\n" );
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document.write( "Edwin

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