1.	The graph of a linear function is _______.
		A.	None of these is correct	B.	a horizontal line only
		C.	a straight line	D.	a curved line
		Hint
	2.	Find the equation that has direct variation.
		A.	y = 4x	B.	y = 0.8x + 9
		C.	y = 5x + 1.3	D.	y = –3x – 1
		Hint
	3.	Find the graph that does not have direct variation.
		A.		B.
		C.		D.
		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.	The temperature that begins at 0°F at 6:00 a.m. rises 3°F every hour for 6 hours.
		C.	An airplane that begins at 20,000 feet and descends for a landing on the ground at the airport.
		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 = 4y2	B.	y = 14 + 6x
		C.	y = –3x – 1	D.	y = 8 – x
		Hint