Answer
(3+x)+(7+y)
Work Step by Step
The commutative property holds that $a+b=b+a$, for real numbers a and b.
In this example, we are given $(7+y)+(3+x)$.
We can set (7+y) equal to $a$ and (3+x) equal to $b$.
We know that $a+b=(7+y)+(3+x)$. Therefore, we know that $b+a=(3+x)+(7+y)$.
