The angles below are supplementary. What is the value of x? (5 points)

Answer:
x = 30
Step-by-step explanation:
Angles on a line equal 180
4x + 20 + 40 = 180
4x + 60 = 180
Minus 60 on both sides.
4x = 120
Divide by 4 on both sides.
x = 30