Y-3=4/11(x-11). Doing a problem like this is mostly memorizing point slope formula, by knowing y-y2=m(x-x1) you can just "plug" in 3 as your y1 and 11 as your x1 then finally 4/11 as your slope being y-3=4/11(x-11)
The answer to this question should be True. The perpendicular bisector, by definition, is the midpoint between two points that forms a right angle with them. It must be equidistant from R and S in order to be a perpendicular bisector.