anonymous
  • anonymous
When point E (-9, 3) is rotated 180� about the origin, its coordinate becomes (3, 9). True False
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
false (-9, -3)
anonymous
  • anonymous
thanks hun!
anonymous
  • anonymous
your welcome

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anonymous
  • anonymous
how do you know its -9 -3?
mathmate
  • mathmate
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)
anonymous
  • anonymous
^know that, or you become a lazy slob like me who imagined it on the coordinate plane instead of remembering the rule. (Facepalm)
mathmate
  • mathmate
You have a point. But to help someone, we need something concrete to work on.
anonymous
  • anonymous
thanks everyone!
myininaya
  • myininaya
I see nothing wrong with imagining it on a coordinate plane. The rule makes more since that way.
myininaya
  • myininaya
sense*

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