Determine whether each graph represents y as a function of x?

1.

2.

3. For the function f graphed in Exercise 18, what is f(2)?
4. For the function f graphed in Exercise 18, for what values of x does f(x) = 0?
5. The following table defines y as a function of x, denoted y = f(x).

Use the table to complete the following.
(a) Identify the domain and range of y = f(x).
(b) Find f(4).
(c) Find all x-values for which f(x) = 2.
(d) Graph y = f(x).

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