The first step is to find the distance from the given point to each of the two foci as follows: Distance D1: (D1)^2 = (9-1)^2 + (0-6)^2 = 100 D1 = 10 Distance D2: (D2)^2 = (11-1)^2 + (6-6)^2 = 100 D2 = 10
The constant sum is the summation of the two distances as follows: constant sum = D1 + D2 = 10 + 10 = 20
