Question

find the value of $f(9)$.
$y = f(x)$

Explanation:

Step1: Identify right segment equation

The right segment passes through $(0,0)$ and has a slope of $1$, so its equation is $y = x$ (valid for $x \geq 0$).

Step2: Substitute $x=9$ into the equation

Since $9 \geq 0$, use $y = x$.
$y = 9$

Answer:

$9$