SOLUTION: Quadrilateral QRST is a rectangle. RT = 5x + 1 and QS = 6x – 3. Find QS

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Question 381633: Quadrilateral QRST is a rectangle. RT = 5x + 1 and QS = 6x – 3. Find QS
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,         

Rectangle QRST, RT AND QS are diagonals

Diagonals of a rectangle are of equal length

      RT = QS

  5x + 1 = 6x - 3

       4 = x

    QS = 6*4 - 3 = 21