Posted by Anonymous on Sunday, May 23, 2010 at 12:02am.
An easy way to do this would be to graph the points. There are actually two answers: one for the case in which Q and R are at opposite corners, and another for the case in which QR is a side of the parallelogram. I assume they want the latter. In that case, S is (8,0). Just make the changes in x and y when going from R to S the same as the changes going from Q to P.
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