1.	Determine the value of r so that the line through (r, 4) and (-7, 7) has a slope of .
		A.	-3	B.	-11
		C.	3	D.	9
		Hint
	2.	Determine the slope of the line that passes through (2, 2) and (5, 8).
		A.	-2	B.
		C.		D.	2
		Hint
	3.	Find the slope of the line that passes through (5, -5) and (9, -5).
		A.	0	B.
		C.	undefined	D.
		Hint
	4.	Find the slope of the line that passes through (-2, 9.5) and (4, 5).
		A.		B.
		C.	0	D.	undefined
		Hint
	5.	Which of the following pairs of coordinates are on a line with an undefined slope?
		A.	(-2, -2), (4, 4)	B.	(2, 1), (5, -2)
		C.	(-4, -3), (3, -3)	D.	(3, -2), (3, 5)
		Hint