What is the rule for a 90 degree clockwise rotation?

Question

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(x,y) → (-y, x)
(x,y) → (-x, -y)
(x,y) → (y, -x)

Answer 1

The rule for a 90-degree clockwise rotation of a point \((x, y)\) is:

\[ (x, y) \rightarrow (y, -x) \]

This means that for a point at coordinates \((x, y)\), after a 90-degree clockwise rotation, its new coordinates will be \((y, -x)\).