A line segment has endpoints (1,1) and ( 4, 4). Demonstrating the properties of reflections across the y-axis what are the reflected endpoints

When reflecting a point across the y-axis, the x-coordinate changes its sign while the y-coordinate remains the same.

The coordinates (1,1) will be reflected to (-1,1) and (4,4) will be reflected to (-4,4).
Therefore, the reflected endpoints of the line segment are (-1,1) and (-4,4).