Due to the Property of Opposite Angles, Angle 2 = Angle 4
Therefore:
x + 16 = 4x - 5 Add 5 to both sides, subtract x from both sides
21 = 3x
x = 7
Substituting:
Angle 2 = 7 +16 = 23°
Angle 4 = Angle 2 = 23° Again, Property of Opposite Angles
Due to the Property of Supplementary Angles. Angle 1 + Angle 2 = 180°
23 + Angle 1 = 180
Angle 1 = 157°
Due to the Property of Opposite Angles, Angle 1 = Angle 3 = 157°
