document.write( "Question 191571: Points x(-1,1), y(3,5), and z(17,1) are coordinates of three vertices of a parrallelogram. Waht are the possible coordinates of w, the fourth vertex? \n" ); document.write( "
Algebra.Com's Answer #143723 by RAY100(1637)\"\" \"About 
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distance between points x and y are x=+4, y=+4\r
\n" ); document.write( "\n" ); document.write( "add these to (17,1) and we arrive at ( 21,5)\r
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\n" ); document.write( "\n" ); document.write( "subtract these from (17,1) and we arrive at (13,-3)\r
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\n" ); document.write( "\n" ); document.write( "Both make parallelograms
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