Question

Can anybody help me with the explanation

Answer 1

Answer:

see explanation

Step-by-step explanation:

$f(3)$ means the y-coordinate of the point $(3, y)$ that lies on $f(x)$.

Aha! Now we have a path to the solution!

We can test random values for $y$, such as $(3, 1)$, $(3, 2)$, or even $(3, 1000)$.

This leads us to drawing lines.

Answer: We draw the line $x=3$(equivalent of testing out random points), and where it intersects the graph of $f(x)$! is our answer!

(Note: it can only intersect once, otherwise it would fail the vertical line test and wouldn't be a function)