1.	Which characteristic describes a graph that is linear and has direct variation.
		A.	Variables x and y are not proportional.
		B.	The equation has the form y = mx + b.
		C.	The equation has the form y = mx.
		D.	The graph does not pass through (0, 0).
		Hint
	2.	Find the equation that has direct variation.
		A.	y = –3x – 1	B.	y = 4x
		C.	y = 0.8x + 9	D.	y = 5x + 1.3
		Hint
	3.	Find the equation that contains a decreasing linear relationship.
		A.	y = 4x – 3	B.	y = 10 + x
		C.	y = 12+ 2x	D.	y = 5 – 6x
		Hint
	4.	Find the situation that involves a decreasing linear relationship and has direct variation.
		A.	A submarine that begins at the bottom of the ocean and is raised to the surface of the water at 15 meters per second.
		B.	An airplane that begins at 20,000 feet and descends for a landing on the ground at the airport.
		C.	The temperature that begins at 0°F at 6:00 a.m. rises 3°F every hour for 6 hours.
		D.	A bucket that begins at ground level and is lowered into a well at a rate of 1 foot per second.
		Hint
	5.	Find the equation that is nonlinear.
		A.	y = 14 + 6x	B.	y = 8 – x
		C.	y = –3x – 1	D.	y = 4y2
		Hint