To reflect a point across the y-axis, you keep the y-coordinate the same and change the sign of the x-coordinate.
Given the endpoints:
- For the point (1, 1), its reflection across the y-axis is (-1, 1).
- For the point (4, 4), its reflection across the y-axis is (-4, 4).
Thus, the reflected endpoints are: (−1, 1) and (−4, 4).
So the correct response is: (−1, 1) and (−4, 4).