If "right bisector" means perpendicular bisector, then T lies on the perpendicular bisector of UV if and only if T is equidistant from U and V.
Distance from T to U: √[(2-3)2 + (-1-5)2] = √37
Distance from T to V: √[(2-(-3))2 + (-1-(-1))2] = 5
So, T is NOT on the perpendicular bisector of UV.