#### Answer

(3, 7)

#### Work Step by Step

Given: The y axis is the perpendicular bisector of Line Segment AB. Find the
coordinates of R if S is the point (-3, 7).
As y-axis is the Perpendicular bisector of Line Segment AB, Line Segment AB has to be Parallel to the x-axis.
One end of the line segment is given as (-3, 7) so the other end would simply be a "Reflection" of the given value. This is because y-axis is the perpendicular bisector of the given line segment.
Therefore, the coordinates of point S would be (3, 7).
Reflection over y-axis: $ (x, y) => (-x, y) $