1.	Which graph shows a line with an undefined slope?
		A.		B.
		C.		D.
		Hint
	2.	Find the slope of the line.
		A.		B.	4
		C.	0	D.
		Hint
	3.	Determine the slope of any line perpendicular to .
		A.	3	B.
		C.	-3	D.
		Hint
	4.	Find the value of x so the line that passes through (x, 5) and (12, 2) is perpendicular to the line that passes through (0, 1) and (2, 7).
		A.	4	B.	-3
		C.	5	D.	3
		Hint
	5.	Which graph has a slope of zero?
		A.		B.
		C.		D.
		Hint