Respuesta :

Answer:

w = 10

Step-by-step explanation:

Here, we want to find the value of w

Since the three points are collinear, then;

RS + ST = RT

Thus;

81 = 2w + 1 + 6w

81 = 8w + 1

8w = 81-1

8w = 80

w = 80/8

w = 10