1.	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 are two elements in the domain that are paired with the same element in the range.
		C.	Yes, because every relation is a function.
		D.	No, because there is an element in the domain that is paired with two elements in the range.
		Hint
	2.	Determine whether the graph is a function. Explain.
		A.	The graph does not provide enough information.	B.	Yes, the graph passes the vertical line test.
		C.	No, because there are two elements in the domain that are paired with the same element in the range.	D.	No, the graph fails the vertical line test.
		Hint
	3.	Select the relation that is a function.
		A.
		B.
		C.
		D.
		Hint
	4.	Functions can be expressed using which of these?
		A.	graphs	B.	all of these
		C.	tables	D.	ordered pairs
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint