Answer:
![XY=13\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4x4alj9lyynnp7hvfq4cholvsx88fh2ob8.png)
Explanation:
The question is
Find the value of XY
see the attached figure to better understand the problem
we know that
-----> by segment addition postulate
If X is the midpoint WY
then
![WX=XY](https://img.qammunity.org/2020/formulas/mathematics/middle-school/uohdoaj1eqcufv93o5cvdld5b94vtq8oas.png)
substitute in the formula above
substitute the given values and solve for XY
Subtract 6 both sides
Divide by 2 both sides
Rewrite
![XY=13\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4x4alj9lyynnp7hvfq4cholvsx88fh2ob8.png)