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.	ordered triple
		C.	sum	D.	ordered pair
		Hint
	2.	What are the solutions to the system y + 2x – 5z = 4, –2y – 4x + 10z = 8, 3y + x – 3z = 5?
		A.	no solution	B.	infinite
		C.	(2, 2, 1)	D.	(2, 2, –2)
		Hint
	3.	At a firm, there are three workers that are supposed to work a combined 110 hours per week. Worker 1 is supposed to work 5 hours more than worker 2, and worker 2 is supposed to work 15 hours more than worker 3. How long should each one work?
		A.	worker 1: 42.5worker 2: 37.5worker 3: 30	B.	worker 1: 45worker 2: 40worker 3: 25
		C.	worker 1: 45worker 2: 35worker 3: 30	D.	worker 1: 40worker 2: 45worker 3: 25
		Hint
	4.	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: 54worker 2: 28worker 3: 28	D.	worker 1: 44worker 2: 33worker 3: 33
		Hint
	5.	What is true about a system of equations in three variables that has 1 solution?
		A.	planes have no points in common	B.	planes intersect in one line
		C.	planes intersect in the same plane	D.	planes intersect in one point
		Hint