we swap the co-ordinates and give the new y co-ordinate the opposite sign.
90 degrees clockwise(y, -x)
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The effect of the rotation is the same as that of a 90 degree clockwise rotation. In matrix notation, it is equivalent to [post-]multiplication by the 2x2 matrix: { 0 1 } {-1 0 }
The answer will depend on whether the rotation is clockwise or anti-clockwise.
Both will end up on the same place. Using a compass rose as an example: 270 clockwise will point to the west. 90 counterclockwise will also point west.
A transformation, in the form of a rotation requires the centre of rotation to be defined. There is no centre of rotation given.
90 degree anticlockwise.