Question

The angles below are supplementary. What is the value of X?

A. 5
B. 7.5
C. 15
D. 30

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Answer 1

So you make your equation 4x+20+40=180.
Add like terms and get 4x+60=180.
Subtract 60 from both sides, get 4x=120.
Divide boths sides by 4, get your answer of x=30.
Hope this helps

Answer 2

30. A straight line is 180
Take 40 = 140
Take 20 = 120
Divide by 4 = 30
4x+20+ 40 = 180
Rearrange to find x
X= 180-60 all divided by 4
X= 120/4
X= 30