To reflect a point across the y-axis, you change the sign of the x-coordinate while keeping the y-coordinate the same.
For point K with coordinates (6, 3):
- The x-coordinate is 6, and reflecting across the y-axis would change it to -6.
- The y-coordinate remains 3.
Therefore, the new coordinates for the reflected point K would be (-6, 3).
None of the answer choices provided are correct based on this reflection. If you have any further questions or need additional assistance, feel free to ask!