To reflect a point across the y-axis, you change the sign of the x-coordinate while keeping the y-coordinate the same.
Starting with the coordinates of point K, which are (6, 3):
- The x-coordinate changes from 6 to -6.
- The y-coordinate remains as 3.
Therefore, the new coordinates for the reflected point K would be (-6, 3).
So the correct response is: (−6, 3).