Linear Algebra with Applications (2-Download)

5th Edition

ISBN: 9780321796974

Author: Otto Bretscher

Publisher: PEARSON

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Textbook Question

Chapter 9.1, Problem 47E

The interaction of two populations of animals is modeled by the differential equations
| d x d t = − x + k y d y d t = k x − 4 y |
for some positive constant k.
a. What kind of interaction do we observe? What is the practical significance of the k?
b. Find the eigenvalues of the coefficient matrix of the system. What can you say about the signs of these eigenvalues? How does your answer depend on the value of the constant k?
c. For each case you discussed in part (b), sketch a rough phase portrait. What does each phase portrait tell you about the future of the two populations?

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Chapter 9.1, Problem 46E

Chapter 9.1, Problem 48E

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Graph without using the calculator y-1 = | x+4 |

Chapter 9 Solutions

Linear Algebra with Applications (2-Download)

Ch. 9.1 - Solve the nonlinear differential equations in...Ch. 9.1 - Find a differential equation of the form dx/dt=kx...Ch. 9.1 - In 1778, a wealthy Pennsylvanian merchant named...Ch. 9.1 - The carbon in living matter contains a minute...Ch. 9.1 - Justify the “Rule of 69”: If a quantity grows at a...Ch. 9.1 - For the values of1and2given in Exercises 16...Ch. 9.1 - For the values of1and2given in Exercises 16...Ch. 9.1 - For the values of1and2given in Exercises 16...Ch. 9.1 - For the values of1and2given in Exercises 16...Ch. 9.1 - Consider the system dx/dt=Axwith A=[0110] . Sketch...Ch. 9.1 - Consider the system dx/dt=Axwith A=[0100] . Sketch...Ch. 9.1 - Consider the linear system dx/dt=Ax of arbitrary...Ch. 9.1 - Consider the linear system dx/dt=Ax of arbitrary...Ch. 9.1 - Let A be an nn matrix and k a scalar. Consider the...Ch. 9.1 - Let A be an nn matrix and k a scalar. Consider the...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - In Exercises 26 through 31, solve the system with...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Sketch rough phase portraits for the dynamical...Ch. 9.1 - Find a 22 matrix A such that the system dx/dt=Ax...Ch. 9.1 - Consider a noninvertible 22 matrix A with two...Ch. 9.1 - Consider the interaction of two species of animals...Ch. 9.1 - Answer the questions posed in Exercise 42 for the...Ch. 9.1 - Answer the questions posed in Exercise 42 for the...Ch. 9.1 - Two herds of vicious animals are fighting each...Ch. 9.1 - Repeat Exercise 45 for the system | dx dt=py dy...Ch. 9.1 - The interaction of two populations of animals is...Ch. 9.1 - Repeat Exercise 47 for the system | dx dt=x+ky dy...Ch. 9.1 - Here is a continuous model of a person’s glucose...Ch. 9.1 - Consider a linear system dx/dt=Ax , where A is a...Ch. 9.1 - Let x(t) be a differentiable curve in n and S an...Ch. 9.1 - Find all solutions of the system dxdt=|10|x where ...Ch. 9.1 - Solve the initial value problem dxdt=|pqqp|x with...Ch. 9.1 - Consider a door that opens to only one side (as...Ch. 9.1 - Answer the questions posed in Exercise 54 for the...Ch. 9.2 - Use the definition of the complexvalued...Ch. 9.2 - Use the definition of the complexvalued...Ch. 9.2 - Use the definition of the complexvalued...Ch. 9.2 - Sketch the trajectory of the complexvalued...Ch. 9.2 - Sketch the trajectory of the complexvalued...Ch. 9.2 - Find all complex solutions of the system...Ch. 9.2 - Determine the stability of the system dxdt=[1234]x Ch. 9.2 - Consider a sytem dxdt=Ax where A is a symmetric...Ch. 9.2 - Consider a sytem dxdt=Ax where A is a 22 matrix...Ch. 9.2 - Consider a quadratic form q(x)=xAx of two...Ch. 9.2 - Do parts a and d of Exercise 10 for a quadratic...Ch. 9.2 - Determine the stability of the system...Ch. 9.2 - If the system dx/dt=Ax is stable, is dx/dt=A1x...Ch. 9.2 - NegativeFeedbackLoops. Suppose some quantities...Ch. 9.2 - Consider a noninvertible 22 matrix A with a...Ch. 9.2 - Consider the system dxdt=[01ab]x where a and b are...Ch. 9.2 - Consider the system dxdt=[0kk1]x where k is an...Ch. 9.2 - Consider a diagonalizable 33 matrix A such that...Ch. 9.2 - True or False? If the trace and the determinant of...Ch. 9.2 - Consider a 22 matrix A with eigenvalues i . Let +i...Ch. 9.2 - Ngozi opens a bank account with an initial balance...Ch. 9.2 - Find each of the linear systems in Exercises 22...Ch. 9.2 - Find each of the linear systems in Exercises 22...Ch. 9.2 - Find each of the linear systems in Exercises 22...Ch. 9.2 - Find each of the linear systems in Exercises 22...Ch. 9.2 - Prob. 26E Ch. 9.2 - Prob. 27E Ch. 9.2 - Prob. 28E Ch. 9.2 - Prob. 29E Ch. 9.2 - Prob. 30E Ch. 9.2 - Prob. 31E Ch. 9.2 - Prob. 32E Ch. 9.2 - Prob. 33E Ch. 9.2 - Prob. 34E Ch. 9.2 - Prob. 35E Ch. 9.2 - Prob. 36E Ch. 9.2 - Prob. 37E Ch. 9.2 - Prob. 38E Ch. 9.2 - Prob. 39E Ch. 9.2 - Prob. 40E Ch. 9.3 - Find all real solutions of the differential...Ch. 9.3 - Prob. 2E Ch. 9.3 - Prob. 3E Ch. 9.3 - Prob. 4E Ch. 9.3 - Prob. 5E Ch. 9.3 - Prob. 6E Ch. 9.3 - Prob. 7E Ch. 9.3 - Prob. 8E Ch. 9.3 - Prob. 9E Ch. 9.3 - Prob. 10E Ch. 9.3 - Prob. 11E Ch. 9.3 - Prob. 12E Ch. 9.3 - Find all real solutions of the differential...Ch. 9.3 - Prob. 14E Ch. 9.3 - Prob. 15E Ch. 9.3 - Prob. 16E Ch. 9.3 - Prob. 17E Ch. 9.3 - Prob. 18E Ch. 9.3 - Prob. 19E Ch. 9.3 - Prob. 20E Ch. 9.3 - Prob. 21E Ch. 9.3 - Prob. 22E Ch. 9.3 - Prob. 23E Ch. 9.3 - Prob. 24E Ch. 9.3 - Prob. 25E Ch. 9.3 - Prob. 26E Ch. 9.3 - Prob. 27E Ch. 9.3 - Prob. 28E Ch. 9.3 - Prob. 29E Ch. 9.3 - Prob. 30E Ch. 9.3 - Prob. 31E Ch. 9.3 - Prob. 32E Ch. 9.3 - Prob. 33E Ch. 9.3 - Prob. 34E Ch. 9.3 - Prob. 35E Ch. 9.3 - Prob. 36E Ch. 9.3 - Prob. 37E Ch. 9.3 - Prob. 38E Ch. 9.3 - Prob. 39E Ch. 9.3 - Prob. 40E Ch. 9.3 - Prob. 41E Ch. 9.3 - Prob. 42E Ch. 9.3 - Prob. 43E Ch. 9.3 - The displacement of a certain forced oscillator...Ch. 9.3 - Prob. 45E Ch. 9.3 - Prob. 46E Ch. 9.3 - Prob. 47E Ch. 9.3 - Prob. 48E

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Solution Summary: The author explains how the relationship between two populations of animals is symbiotic.

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Chapter 9 Solutions