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