Respuesta :
The two angles labelled are equal because they are vertically opposite.
11(y - 10) = 4y - 5
11*y - 11*10 = 4y - 5
11y - 110 = 4y - 5
11y - 4y = -5 + 110
7y = 105
y = 105/7
y = 15
But PTS: 11(y - 10) = 11(15 - 10) = 11*5 = 55
Angle PTS = 55 degrees
11(y - 10) = 4y - 5
11*y - 11*10 = 4y - 5
11y - 110 = 4y - 5
11y - 4y = -5 + 110
7y = 105
y = 105/7
y = 15
But PTS: 11(y - 10) = 11(15 - 10) = 11*5 = 55
Angle PTS = 55 degrees