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OpenStudy (anonymous):

(please help me !!!!:( ) If P(-2, 1) is rotated 90°, its image is ???????

OpenStudy (whpalmer4):

|dw:1371520459248:dw|

OpenStudy (whpalmer4):

assuming we are rotating about the origin

OpenStudy (whpalmer4):

look at the diagram with your head tilted to the left. now tilt your head back to normal (hopefully that is pointing up :-) and see if you agree with where I put P'

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