Rotate parabola 90 degrees

What is the rule for a rotation of 90 degrees clockwise? Rule: When you rotate a figure of 90 degrees in a clockwise direction, every point of the given figure must be changed from (x, y) for (y, -x) and graphically represent the figure rotated. Here are some examples to understand how clockwise rotation of 90 degrees can be done on a figure. ................
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