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.	No; The ordered pairs on not on one line.	D.	Yes; It passes the vertical line test.
		Hint
	2.	Determine whether the relation {(7, 2), (-10, 3), (-5, -1), (7, 3)} is a function. Explain.
		A.	Yes, because each element in the domain is paired with exactly one element in the range.
		B.	No, because there is an element in the domain that is paired with two elements in the range.
		C.	Yes, because every relation is a function.
		D.	No, because there are two elements in the domain that are paired with the same element in the range.
		Hint
	3.	Select the relation that is a function.
		A.	{(21, 11), (21, 10), (21, 9), (21, 8)}
		B.	{(-6, -5), (3, 2), (10, 8), (3, 3)}
		C.	{(5, 10), (-3, 10), (-3, -10), (4, 7)}
		D.	{(-2, -1),(5, -1), (16, 3), (-3, -9)}
		Hint
	4.	Functions can be expressed using which of these?
		A.	ordered pairs	B.	graphs
		C.	tables	D.	all of these
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint