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To reflect a point over the y-axis, we keep its x-coordinate the same and change the sign of its y-coordinate.
The reflected coordinates of A will be A'(-5, -1).
The reflected coordinates of B will be B'(-5, -6).
The reflected coordinates of C will be C'(-1, -6).
Therefore, the coordinates of the reflected triangle are A'(-5, -1), B'(-5, -6), and C'(-1, -6).