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2331_quiz1

# 2331_quiz1 - x A y b z = and it is in row-echelon form 1 1...

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1 Math 2331 Quiz 1 Sections 2.1 and 2.2 This is an online quiz; submit your answers using your CASA account. The instructions on how to submit this quiz are given on your instructor’s website. Solve the system: 2 5 6 5 7 x y x y = - = 1. ? x = a) 0 b) 2 c) 1 d) 4 e) -1 f) none of these 2. ? y = Solve the system without elimination: ° 1 0 2 2 2 0 3 1 1 ± ² ³ ´ µ ¶ = ° 3 4 5 ± 3. ? x = 4. ? x y z + + = 5. If · = ° 1 2 0 1 1 −1 0 2 2 ± and ¸ = ° 1 2 1 ± , then ·¸ = a) ° 3 0 5 ± b) ° −2 1 4 ± c) ° 3 0 4 ± d) ° 5 0 6 ± e) ° 3 1 4 ± f) none of these 6. The following augmented matrix belongs to the system x A y b z     =       and it is in row-echelon form. 1 1 1 5 0 4 0 4 ; ? 0 0 2 8 x - =

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2 7. The following augmented matrix belongs to the system
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Unformatted text preview: x A y b z = and it is in row-echelon form. 1 1 1 5 4 4 ; ? 8 x- = a) 4 b) 12 c) 8 d) 0 e) No solution f) None of these Consider the following system for questions 8--10; & 1 2 2 2 5 3 2 7 ± ² ³ ´ µ ¶ = · 8. What is the row-echelon form of the coefficient matrix? a) & 1 2 2 5 7 ± b) & 1 2 2 1 ± c) & 1 2 2 1 3 ± d) none of these 9. What are the pivots? a) 1, 2 and 7 b) 1, 2 and 0 c) 1 and 2 d) 1, 2, and 3 e) none of these 10. For which of the following b ’s would the system have a solution? a) · = & 4 5 1 ± b) · = & 4 5 −1 ± c) · = & 4 5 9 ± d) · = & 4 5 −5 ± e) none of these...
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