Given data:
The original coordinate of A is (5,10).
The original coordinate of B is (-8, 1).
The original coordinate of C is (7, 6).
The coordinate of A after reflection over the x-axis is,
The coordinate of B after reflection over the y-axis is,
The coordinate of C after reflection over the y-axis is,
Thus, the final coordinate of A is (5, -10), the final coordinate of B is (8, 1), and final coordinate of C is (-7, 6).