Respuesta :

The sum of a triangle is 180 degrees so the value for x would be 9
A sum of the angles of a triangle will always be 180 degrees total.

50 + 50 + 9x - 1 = 180
100 + 9x - 1 = 180
99 + 9x = 180
Subtract 99 from both sides.
9x = 81
Divide each side by 9.
x = 9

Answer: x = 9