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The line of reflection that produces Y′(9, 3) is the x-axis.
When a point is reflected over the x-axis, the y-coordinate remains the same and the sign of the y-coordinate changes. In this case, Y(−9, 3) reflected over the x-axis becomes Y′(9, -3).
Therefore, the line of reflection that produces Y′(9, 3) is the x-axis.