Question

For what value of x is line a parallel to line b? x = ____

Answer 1

I’m going to assume you meant “what is the value of x” and “line A is parallel to line B”

Because they are parallel, the equation and 80 degrees are the same, so:

2x+20=80

Now just solve for x

2x+20=80
-20 -20

2x=60
— —
2 2

X=30