1.	Is the relation whose graph is shown below a function?
		A.	No; The ordered pairs on not on one line.	B.	Yes; It passes the vertical line test.
		C.	Yes; Each element of the range is unique.	D.	No; It does not pass the vertical line test.
		Hint
	2.	Determine whether the relation is a function. Explain.
		A.	Yes, because every relation is a function.
		B.	No, because there is an element in the domain that is paired with two elements in the range.
		C.	No, because there are two elements in the domain that are paired with the same element in the range.
		D.	Yes, because each element in the domain is paired with exactly one element in the range.
		Hint
	3.	Select the relation that is a function.
		A.	{(-6, -5), (3, 2), (10, 8), (3, 3)}
		B.	{(-2, -1),(5, -1), (16, 3), (-3, -9)}
		C.	{(5, 10), (-3, 10), (-3, -10), (4, 7)}
		D.	{(21, 11), (21, 10), (21, 9), (21, 8)}
		Hint
	4.	Which relation is not a function?
		A.	{(2, 4), (3, 5), (2, 7)}
		B.	{(1, 1), (2,2), (3, 3)}
		C.	{(-2, 1), (2, 3), (6, 5)}
		D.	{10, 0), (2, 4), (-2, 4)}
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint