Finding A Missing Ordinate (Analytic Geometry - Distance Formula)

Question

The sum of distances from a point P to (8,0) and (-8,0) is 20. If the abscissa of P is 6, find the ordinate. I'm a little confused about this problem.

Answer 1

P = (6, y)

√[(6 - 8)² + (0 - y)²] + √[(6 + 8)² + (0 - y)²] = 20