Hey there!! 
We know:- Vertically opposite angles are equal. 
Hence, 
Angle 1 = Angle 2 
... 6x + 11 = 10x - 9 
... 20 + 6x = 10x 
... 20 = 4x 
... x = 20 / 4 
... x = 5 
Angle 1 = 6x + 11 
... 6 ( 5 ) + 11 
... 30 + 11 
... 41 
Hence, the measure of angle 1 is 41 degrees. 
Hope my answer helps!