For exercises 1-6, decide whether each graph is the graph of a function. Then determine domains and range.

1.

(a) Is it a function?

(b) Range:

(c) Domain:

2.

(a) Is it a function?

(b) Range:

(c) Domain:

3.

(a) Is it a function?

(b) Range:

(c) Domain:

4.

(a) Is it a function?

(b) Range:

(c) Domain:

5.

(a) Is it a function?

(b) Range:

(c) Domain:

6.

(a) Is it a function?

(b) Range:

(c) Domain:

For exercises 7-12, use each table to determine whether the relation is a function. Then determine the domain and range.

13. {(0, -7), (2, 5), (-3, 1), (-8, 0)}

(a) Is it a function?

(b) Range:

(c) Domain:

14. {(3, -5), (8, -6), (3, 7), (5, 9)}

(a) Is it a function?

(b) Range:

(c) Domain:

15. {(-4, 7), (2, -3), (7, 7), (-5, 1)}

(a) Is it a function?

(b) Range:

(c) Domain:

16. {(0, -4), (0, 2), (0, 1), (0, 0)}

(a) Is it a function?

(b) Range:

(c) Domain:

17. {(8, -3), (2, -3), (9, -3), (-1, -3)}

(a) Is it a function?

(b) Range:

(c) Domain:

18. {(9, 7), (4, 3), (-2, 0), (9, 1)}

(a) Is it a function?

(b) Range:

(c) Domain:

Extra Practice with Functions as Equations

Determine if the following is an equation of a function or not. Explain your reasoning clearly.

1) [latex]x+y^{2}=4[/latex]

2) [latex]x^{2}+y^{2}=4[/latex]

3) [latex]\left| x-1 \right|+y=2[/latex]

4) [latex]y=x^{2}-1[/latex]

5) [latex]x=\sqrt{y-1}[/latex]

6) [latex]\left| x \right|+\left| y \right|=5[/latex]