1.	Determine the value of r so that the line through (5, 2) and (7, r) has a slope of .
		A.	6	B.	1
		C.	2	D.	3
		Hint
	2.	Determine the value of r so that the line through (r, 4) and (-7, 7) has a slope of .
		A.	9	B.	3
		C.	-11	D.	-3
		Hint
	3.	Determine the slope of the line graphed below.
		A.		B.
		C.		D.	0
		Hint
	4.	Find the slope of the line that passes through (5, -5) and (9, -5).
		A.		B.	0
		C.	undefined	D.
		Hint
	5.	Find the slope of the line that passes through (-2, 9.5) and (4, 5).
		A.		B.	0
		C.	undefined	D.
		Hint