1.	The graph of a linear function is _______.
		A.	a horizontal line only	B.	None of these is correct
		C.	a curved line	D.	a straight line
		Hint
	2.	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.
		C.	The graph does not pass through (0, 0).
		D.	The equation has the form y = mx + b.
		Hint
	3.	Find the equation that has direct variation.
		A.	y = 5x + 1.3	B.	y = 4x
		C.	y = 0.8x + 9	D.	y = –3x – 1
		Hint
	4.	Find the graph that is nonlinear.
		A.		B.
		C.		D.
		Hint
	5.	Find the equation that is nonlinear.
		A.	y = 8 – x	B.	y = 4y2
		C.	y = –3x – 1	D.	y = 14 + 6x
		Hint