PLEASE HELP MEEEEE!!!

Answer:
y = 5 units
Step-by-step explanation:
It is given from the image that both the polygons are similar.
Corresponding sides of the similar polygons will be proportional.
By this property ratio of the sides of the given polygons will be,
[tex]\frac{4}{x}=\frac{z}{9}=\frac{2}{6}=\frac{3}{w}=\frac{y}{15}[/tex]
We have to find the value of y.
Therefore, we will take the ratio,
[tex]\frac{2}{6}=\frac{y}{15}[/tex]
y = [tex]\frac{2\times 15}{6}[/tex]
y = 5
Measure of side y = 5 units will be the answer.