1.	The solution of a system of three linear equations in three variables, x, y, and z, is called a(n) ____ (x, y, z).
		A.	ordered triple	B.	ordered pair
		C.	integer	D.	sum
		Hint
	2.	A graph of a system of three linear equations in three variables is shown below. How many solutions does the system have?
		A.	infinite number	B.	2
		C.	1	D.	0
		Hint
	3.	What are the solutions to the system y + 2x – 5z = 4, –2y – 4x + 10z = 8, 3y + x – 3z = 5?
		A.	(2, 2, –2)	B.	no solution
		C.	infinite	D.	(2, 2, 1)
		Hint
	4.	Solve the system 4y – 6x + 8z = 13, 10y – 15x + 20z = 6, y – 5x + 2z = 5.
		A.		B.	no solution
		C.	infinite solutions	D.	(-3, 1, 7)
		Hint
	5.	What is true about a system of equations in three variables that has 1 solution?
		A.	planes intersect in one line	B.	planes intersect in the same plane
		C.	planes intersect in one point	D.	planes have no points in common
		Hint