Answer:
∠ JLN = 140°
Explanation:
∠ JLN and ∠ JLK are a linear pair and sum to 180° , that is
4x + 16 + x + 9 = 180
5x + 25 = 180 ( subtract 25 from both sides )
5x = 155 ( divide both sides by 5 )
x = 31
Then
∠ JLN = 4x + 16 = 4(31) + 16 = 124 + 16 = 140°