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Question
question what is the image of the point (-1, 9) after a rotation of 180° counterclockwise about the origin? answer attempt 2 out of 2
Step1: Aplicar regla de rotación
La regla para una rotación de 180° en el sentido anti - reloj alrededor del origen es $(x,y)\to(-x,-y)$.
Para el punto $(-1,9)$, $x = - 1$ y $y = 9$.
Step2: Calcular coordenadas del punto transformado
$-x=-(-1)=1$ y $-y=-9$.
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$(1, - 9)$