Question

Find x in the attachment

Answer 1

4x + 5x = 180 (co interrior angle add up to 180)

9x=180

x=20

therefore the Two angles are

4*20=80

5*20=100

Answer 2

Hey mate
Here is your answer:--

Let the angle with 4x be angle A
and the angle with 5x be angle B

so Angle A + Angle B = 180. [ Angles in linear pair]

4x + 5x = 180
9x = 180
x = 180/9
x = 20


Final answer :- x = 20


Hope this help you mate