Find The Two Trisection Points Of The Line Segment Joining P1(-4,-3) And P2(5,12)?

The pair of coordinates differ in the x direction by 9 units, so the x coordinates of the desired points will be 9/3 = 3 apart.
The pair of coordinates differ in the y direction by 15 units, so the y coordinates of the desired points will be 15/3 = 5 apart.

The points you seek are (-1, 2) and (2, 7).