Explanation:
the other answer is right. and the reason is as described in my answer to the other question with a rotation of 90° counterclockwise.
x and y trade places and the new x (old y) flips the sign.
Answer:
5. A' (5,-3) B'(5,-12) C'(0,-7)
6. A'(3,9) B'(3,4) C'(-3,4) D'(-3,9)
The Rule for 90 degrees counterclockwise is (x,y) becomes (-y,x)
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