Question

apply geometric motions to reflect figures. brianna reflects point p over a line of reflection, resulting in point p. if points p and p have the same y - coordinate, what must be true? (1 point)
the line of reflection is vertical.
the line of reflection is the y - axis.
the line of reflection is the x - axis.
the line of reflection is horizontal.

Explanation:

In a reflection, if the y - coordinates of a point and its image are the same, the line of reflection is vertical. A vertical line of reflection will not change the y - value of a point's coordinates. The y - axis is a specific vertical line, but we just know it's a vertical line in general, not necessarily the y - axis. The x - axis is horizontal and would change the y - coordinate. A horizontal line of reflection would also change the y - coordinate.

Answer:

The line of reflection is vertical.