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Part 1
The diagonals of quadrilateral QRST intersect at Upper P left parenthesis negative 2 comma 3 right parenthesis. QRST has vertices at Upper Q left parenthesis 3 comma 7 right parenthesis and Upper R left parenthesis negative 3 comma 5 right parenthesis. What must be the coordinates of Upper S and Upper T to ensure that QRST is a​ parallelogram?
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Part 1
The coordinates of Upper S must be
  
enter your response here. ​(Type an ordered​ pair.)