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.	integer	B.	sum
		C.	ordered triple	D.	ordered pair
		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.	infinite	B.	(2, 2, 1)
		C.	(2, 2, –2)	D.	no solution
		Hint
	4.	Solve the system 4y – 6x + 8z = 13, 10y – 15x + 20z = 6, y – 5x + 2z = 5.
		A.	infinite solutions	B.	no solution
		C.	(-3, 1, 7)	D.
		Hint
	5.	At a firm, there are three workers that are supposed to work a combined 110 hours per week. Worker 1 gets paid $10 per hour, worker 2 gets paid $12 per hour, and worker 3 gets paid $14 per hour. If the company wants their total income to be $1268, how many hours should each one work if worker 3 and worker 2 work for the same amount of hours?
		A.	worker 1: 40worker 2: 35worker 3: 35	B.	worker 1: 14worker 2: 48worker 3: 48
		C.	worker 1: 44worker 2: 33worker 3: 33	D.	worker 1: 54worker 2: 28worker 3: 28
		Hint