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Part 1
The diagonals of quadrilateral QRST intersect at Upper P left parenthesis 3 comma 4 right parenthesis. QRST has vertices at Upper Q left parenthesis 4 comma 7 right parenthesis and Upper R left parenthesis negative 4 comma 6 right parenthesis. What must be the coordinates of Upper S and Upper T to ensure that QRST is a​ parallelogram?