Answer:

Explanation:
It's super easy. Segment WY is equal to the sum of WU and UY segment. That being said,

Here,
So simply substitute the given values of WY,WU and UY, set a equation and just solve for X . Which is done below.

We already know that WU=2x , hence plugging in 9 for x simplifies to 2*9=18 . Therefore the length of
is 18