A cartographer sends a buoy down a river to plot its path. After t hours, the longitude of the buoy was given by x(t) = -3t + 8, and the latitude of the buoy was given by y(t) = 2t^2 - 3t. At the coordinates (5, -1), is the river moving north or south, and is the water hitting the north or south bank of the river?
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