#### Answer

$2b+3a$

#### Work Step by Step

The commutative property of addition holds that $a+b=b+a$, for real numbers a and b. However, since the terms used in this example are a and b, we will say that $x+y=y+a$ to avoid confusion.
In this example, we can set $3a+2b=x+y$.
So, $x=3a$ and $y=2b$.
Therefore, $y+x=2b+3a$.