Reflecting point D across the x-axis changes its y-coordinate sign. The new position, D', is at (-9, 9), where the x-coordinate remains the same, and the y-coordinate changes sign.
The correct answer is option A.
When a point is reflected across the x-axis, its y-coordinate changes sign while the x-coordinate remains the same. In this case, the original position of point D is at -9 on the x-axis.
Reflecting across the x-axis, the new y-coordinate of D' would be the opposite of -9, which is 9. Therefore, the new position of D' would be (x, y) = (-9, 9).
In summary, the reflected point D' is at (-9, 9).
Therefore , from the given options the correct one is A.
The question probable may be:
Where would the new point D' be if reflected across the x-axis? The original position of D is at -9
A. D' is at (-9)
B. D' is at (-8)
C. D' is at (8)
D. D' is at (9)