The following table shows a proportional relationship between $w$ and $z$.
$w$ | $z$ |
:-: | :-: |
$18$ | $2$
$45$ | $5$
$81$ | $9$
**Write an equation to describe the relationship between $w$ and $z$. **
[[☃ expression 1]]
Learn To Be brings free online tutoring students around the United States. Volunteer and gain community service hours while helping students who need it./p>