Answer
$f(x)=x+7$
Work Step by Step
We are given that $y=x+7$, which is an example of a relation between the variables x and y. However, to note that y is a function of x, we can rewrite this as $y=f(x)=x+7$.
This function notation, read as "f of x," tells us that y is a function of x (or that y depends on x).