This time we want to show a 90° rotation about the spot (0, 0) that is clockwise. As you recall, you will have to simulate this with at 270° CCW rotation. Use the 'Mode' button to set this up now ... move the centre spot to (0, 0), and change the rotation to 270° CCW. The object (the brown dot) will look like it is being rotated by 90° clockwise, around the centre spot, to its image, the the blue dot. This graph will allow you to find out what happens to individual coordinates as they are rotated 90° CW. Follow the instructions here. When you are done the exercise, close the exercise window and then check your conclusion.
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