Answer:
x=40
Step-by-step explanation:
It is a straight line, and we know that angles on a straight line are supplementary, or add to 180 degrees.
So, all the angles added together must equal 180 degrees
100+x+x=180
Combine like terms
100+2x=180
Subtract 100 from both sides
2x=80
Divide by 2 on both sides
x=40
Hope this helps! :)
