
	1.	The equation 2x - y + 3z = 5 represents _____________
		A.	a line.	B.	none of these.
		C.	a circle.	D.	a plane.
		Hint

	2.	Three planes can
		A.	intersect in a line.	B.	All of the choices are true.
		C.	have no points in common.	D.	intersect at one point.
		Hint

	3.	Solve the system of 3 equations by substitution. x = 3y + 2z 2x + 3y + 2z = 3 -x + y - z = 6
		A.	no solution	B.	infinite solutions
		C.	(1, 3, -4)	D.	(8, 4, -2)
		Hint

	4.	Solve the system of three equations by elimination: 5x + 2y - 3z = 10 2x - 2y + 4z = 6 x - y + 2z = 3
		A.	infinite solutions	B.	(3, 4, 2)
		C.	no solution	D.	(2, -5, 3)
		Hint

	5.	If you are solving this system of equations by elimination, which of the following is the best choice for the first step? 2x + 3y - z = 4 -x + y + 2z = 3 3x + y + z = 1
		A.	neither method is correct.	B.	Method I
		C.	Method II	D.	both methods are correct
		Hint