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 Help, plz?

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im taking a test, and for some reason the only thing in math i dont understand is rotations! whenever i take a lesson for it, it always seems to avoid telling me what equation do i use to solve it! can someone please tell me what equation would i use to find the new coordinates of a 90 degree rotation?? 

 Dec 2, 2016

Best Answer 

 #1
avatar+33661 
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Old coordinates (x, y)  

 

90 degree anti-clockwise rotation.

 

New coordinates (X, Y) = (-y, x)

 Dec 2, 2016

2+0 Answers

 #1
avatar+33661 
+16
Best Answer

Old coordinates (x, y)  

 

90 degree anti-clockwise rotation.

 

New coordinates (X, Y) = (-y, x)

Alan Dec 2, 2016
 #3
avatar+1002 
+5

Thank you both, its a little more clear to me. It seems so simple though?? maybe im over thinking it. i tend to do that laugh

 Dec 2, 2016

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