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Test Bank for Linear Algebra with Applications, 2e by Jeffrey Holt (All Chapters Download link at the end of this File)
Chapter_1_Systems_of_Linear_Equations
- Determine which of the points (2, –3), (2, 3), and (4, 2) lie on both of the lines and .
ANSWER: (2, 3)
- Determine which of the points (1, 0, –1, 0), (0, 1, 2, 3), and (2, 1, –1, –1) satisfy the linear system
ANSWER: (0, 1, 2, 3)
- Determine which of (3, s2, s1, 2), (0, 0, 0 ,0), (2 – s1 – s2, 1 + s1 + s2, s1, s2), and (3 – s1, s1, s2, 2 – s2) form a
solution to the following system for all choices of the free parameters .
ANSWER: (2 – s1 – s2, 1 + s1 + s2, s1, s2)
- Determine if the system is in echelon form, and if so, identify the leading variables and the free variables. If it
is not in echelon form, explain why.
ANSWER: Not in echelon form since is the leading variable of two equations
- Determine if the system is in echelon form, and if so, identify the leading variables and the free variables. If it
is not in echelon form, explain why.
ANSWER: Echelon form; leading variables: and ; free variable:
- Find all solutions to the system
ANSWER:
- Find all solutions to the system
ANSWER:
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- Find all solutions to the system
ANSWER:
- Reorder the equations to put the following system of three equations with four unknowns in echelon form:
ANSWER:
- Determine the value(s) of so that the following system is consistent.
ANSWER:
- Suppose a system of equations has two free variables. How many leading variables are there?
ANSWER: 10
- True or False: If a linear system has more variables than equations, then the system is inconsistent.
- True
- False
ANSWER: False
- True or False: If a linear system has infinitely many solutions, then there are more variables than equations.
- True
- False
ANSWER: False
- True or False: If a linear system has no free variables, then there exists at most one solution.
- True
- False
ANSWER: True
- Convert the augmented matrix to the equivalent linear system.
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