To reflect a point over the y-axis, you change the sign of the x-coordinate while keeping the y-coordinate the same.
Given point \( D(x, y) = D(5, 6) \), the reflection over the y-axis will be:
- Change the sign of the x-coordinate:
- From \( x = 5 \) to \( x' = -5 \)
- Keep the y-coordinate the same:
- \( y' = 6 \)
Thus, the coordinates of the point \( D' \) after reflecting over the y-axis are:
\[ D'(-5, 6) \]