To reflect a point across both the x-axis and the y-axis, you will change the signs of both the x-coordinate and the y-coordinate.
Given the point \((-10, 11)\):
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Reflect across the x-axis: Change the sign of the y-coordinate. \[ (-10, 11) \rightarrow (-10, -11) \]
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Reflect across the y-axis: Change the sign of the x-coordinate. \[ (-10, -11) \rightarrow (10, -11) \]
So, the coordinates of the point \((-10, 11)\) after reflecting across both axes are \((10, -11)\).