Answer:
steps below
Step-by-step explanation:
(x , y) --> (y , -x) rotated 270 degrees counterclockwise
(y , -x) --> (x , -y) reflected across the line y= -x
(x , -y) --> (-x , -y) reflected across the y axis
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(x , y) --> (-x , -y) rotating (x, y) 180 degrees