Question

What is the image of A(8,2) under R90 ? A. (-2,8) B. (2,8) C.( 8,-2) D.(-8,2)

Answer 1

Answer: A. (-2,8)

Step-by-step explanation:

We know that the rule for rotation of $R_{90}$ is given by :-

$(x,y)\rightarrow(-y,x)$, where (x,y) is the point of pre-image and (-y,x) is a point of image.

The given point of pre-image : A(8,2)

Then after rotation of  $R_{90}$, we have the image point as :-

$(8,2)\rightarrow(-2,8)$

Hence, the image point of A(8,2) is (-2,8) .