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When point E (-9, 3) is rotated 180� about the origin, its coordinate becomes (3, 9). True False

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false (-9, -3)
thanks hun!
your welcome

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Other answers:

how do you know its -9 -3?
If you substitute the rotation matrix for 180 degrees, you'd get the rule T180(x,y)=(-x,-y), so the rotated point should be (9,-3)
^know that, or you become a lazy slob like me who imagined it on the coordinate plane instead of remembering the rule. (Facepalm)
You have a point. But to help someone, we need something concrete to work on.
thanks everyone!
I see nothing wrong with imagining it on a coordinate plane. The rule makes more since that way.

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