Answer:
(-2.5, 4.5)
Explanation:
(2.5, 4.5) is a point in Quadrant 1.
That is the upper right quadrant. When you reflect it over the y-axis, it ends up in Quadrant 2, the upper left quadrant.
The reflected point is the same distance to the left of the y-axis as the original point is to the right of the y-axis.
The y-coordinate remains the same.
The x-coordinate is the opposite of the original x-coordinate.
Answer: (-2.5, 4.5)