Given the coordinates of the original object as
A (2, 6)
B (8, 4)
C(2, 4)
Since we are reflecting the image over the y axis, the coordinates of the new image will be expressed as (-x, y)
The x coordinates will be negated but the y coordinates remains the same as shown:
A' = (-2, 6), B' = (-8, 4) and C' = (-2, 4)
This gives the coordinates of the new image formed after reflecting over the y axis