Answer:
(4, -5)
Explanation:
Seeing as the coordinates of P are (5, 4) and it's a 270 degrees rotation, the transformation rule is:
turns into .
Thus, (5, 4) turns into (4, -5)
-5
When rotating a point (x,y) 270 degrees counterclockwise, the new coordinates become (y, -x).
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turns into 
.