When a point \((x, y)\) is reflected across the y-axis, the new point becomes \((-x, y)\).
Let's apply this to the two points:
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For the point \((6, -3)\): \[ (6, -3) \rightarrow (-6, -3) \]
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For the point \((3, 1)\): \[ (3, 1) \rightarrow (-3, 1) \]
Thus, the two new points after reflecting across the y-axis are \((-6, -3)\) and \((-3, 1)\).
The correct response is: (−6,−3) and (−3, 1).