Think you’ve got your head wrapped around Systems of Equations? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. Which matrix is the identity matrix?
Q. Find the determinant of 
-3
38
-38
22
None of the above
Q. The matrix 
came from what elementary row operation on 
came from what elementary row operation on R2 = -3(R1) + R3
R2 = R1 + R2
R2 = -3(R1) + R2
None of the above
Q. How many elementary row operations are required to reduce the following matrix to row echelon form?
0
1
2
3
4
Q. In row echelon form of a system of equations in four variables, what is the minimum number of zeros in the final matrix?
4
8
12
16
None of the above
Q. In reduced row echelon form of a system of equations in four variables, what is the minimum number of zeros in the final matrix?
4
8
12
16
None of the above
Q. Solve
(-1, 2)
(0, 1)
(2, -1)
(1, 2)
(-1, -2)
Q. Solve
(1, 2, 5)
(-1, 2, -5)
(-1, 2, 5)
(2, 1, 5)
(2, -1, 5)
Q. What elementary row operation is not allowed in matrices?
Adding a row to another row
Multiplying a row then subtracting from another row
Crossing a row out
Dividing a row by a number
None of the above
Q. The augmented matrix uses what numbers?
Coefficients
Inverse
Solution set
Additive inverse
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