The rule for a 270° counterclockwise rotation is (x, y) ---> (y, -x).
So if you rotated (-5,5) 270° counterclockwise around the origin the new coordinates would be (-5,-5).
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Answer:
You can use 5 to simplify 5 and 15, giving you 1 and 3
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Just add 3 to both sides
x = 7
-7 * 12 = -84
but
-7 + 12 = 5