A line contains the points (6,-3) and (3,1). When this line is reflected across the y axis, what are the two new points?

To reflect a point across the y-axis, we change the sign of its x-coordinate while keeping the y-coordinate unchanged.

Given the points (6,-3) and (3,1), reflecting them across the y-axis would result in (-6,-3) and (-3,1) as the new points.