Final answer:
To find the ordered pair of M' after point M (5, 6) is rotated 90° counterclockwise, the x-coordinate becomes the y-coordinate, and the y-coordinate becomes the negative of the x-coordinate.
Step-by-step explanation:
To find the ordered pair of M' after point M (5, 6) is rotated 90° counterclockwise, we can use the rotation rules in the coordinate plane. When a point is rotated counterclockwise by 90°, the x-coordinate becomes the y-coordinate and the y-coordinate becomes the negative of the x-coordinate. Therefore, the ordered pair of M' is (-6, 5). So, the correct answer is option A. M' (-6, 5).