Answer: x = 20
The angles are 40 and 140
Explanation:
Since the angles are supplementary , it means they add up to be 180 , that is
2x + 8x - 20 = 180
10x - 20 = 180
10x = 180 + 20
10x = 200
x = 20
the first angle which is 2x will be 2(20) = 40 , and the second angle which is 8x - 20 will be 8(20) - 20 = 140