Respuesta :

It has 8 factors: 1, 9, x, y, 9x, 9y, xy, 9xy
9xy = 1 * 9xy

9xy = 3 * 3xy

9xy = x * 9y

9xy = y * 9x

9xy = 3x * 3y

From the five pairs, it has 10 factors.