Linear Algebra and Its Applications (5th Edition)
5th Edition
ISBN: 9780321982384
Author: David C. Lay, Steven R. Lay, Judi J. McDonald
Publisher: PEARSON
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Chapter 9.2, Problem 1E
Betty plans to invest a total of $12,000 in mutual funds, certificates of deposit (CDs), and a high-yield savings account. Because of the risk involved in mutual funds, she wants to invest no more in mutual funds than the sum of her CDs and savings. She also wants the amount in savings to be at least half the amount in CDs. Her expected returns are 11% on the mutual funds, 8% on the CDs and 6% on savings. How much money should Betty invest in each area in order to have the largest return on her investments? Set this up as a linear programming problem in the following form: Maximize cTx subject to Ax ≤ b and x ≥ 0. Do not find the solution.
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Question 1. Solve the system
-
x1 x2 + 3x3 + 2x4
-x1 + x22x3 + x4
2x12x2+7x3+7x4
Question 2. Consider the system
= 1
=-2
= 1
3x1 - x2 + ax3
= 1
x1 + 3x2 + 2x3
x12x2+2x3
= -b
= 4
1 For what values of a, b will the system be inconsistent?
2 For what values of a, b will the system have only one solution?
For what values of a, b will the saystem have infinitely many solutions?
Chapter 9 Solutions
Linear Algebra and Its Applications (5th Edition)
Ch. 9.1 - Find the optimal strategies and the value of the...Ch. 9.1 - Player R has a supply of dimes and quarters....Ch. 9.1 - Prob. 2ECh. 9.1 - In the traditional Japanese childrens game janken...Ch. 9.1 - Prob. 4ECh. 9.1 - Prob. 5ECh. 9.1 - Find all saddle points for the matrix games in...Ch. 9.1 - Find all saddle points for the matrix games in...Ch. 9.1 - Find all saddle points for the matrix games in...Ch. 9.1 - Prob. 9E
Ch. 9.1 - Prob. 10ECh. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - Prob. 16ECh. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 11-18, find the optimal row and...Ch. 9.1 - In Exercises 21 and 22, mark each statement True...Ch. 9.1 - In Exercises 21 and 22, mark each statement True...Ch. 9.1 - Find the optimal strategies and the value of the...Ch. 9.1 - Bill and Wayne are playing a game in which each...Ch. 9.1 - Consider the matrix game A=[abcd] where A has no...Ch. 9.2 - Consider the following problem: Maximize 2x1 + x2...Ch. 9.2 - Graph the feasible set for Practice Problem 1.Ch. 9.2 - Find the extreme points of the feasible set in...Ch. 9.2 - Use the answer to Practice Problem 3 to find the...Ch. 9.2 - Betty plans to invest a total of 12,000 in mutual...Ch. 9.2 - A dog breeder decides to feed his dogs a...Ch. 9.2 - In Exercises 3-6, find vectors b and c and matrix...Ch. 9.2 - In Exercises 3-6, find vectors b and c and matrix...Ch. 9.2 - In Exercises 3-6, find vectors b and c and matrix...Ch. 9.2 - In Exercises 3-6, find vectors b and c and matrix...Ch. 9.2 - In Exercises 7-10, solve the linear programming...Ch. 9.2 - In Exercises 7-10, solve the linear programming...Ch. 9.2 - Prob. 9ECh. 9.2 - Prob. 10ECh. 9.2 - Prob. 11ECh. 9.2 - Prob. 12ECh. 9.2 - Prob. 13ECh. 9.2 - Prob. 14ECh. 9.2 - Prob. 15ECh. 9.2 - Prob. 16ECh. 9.2 - Prob. 17ECh. 9.2 - Prob. 18ECh. 9.2 - Prob. 19ECh. 9.3 - Use the simplex method to solve the following...Ch. 9.3 - In Exercises 1 and 2, set up the initial simplex...Ch. 9.3 - Prob. 2ECh. 9.3 - Prob. 3ECh. 9.3 - Prob. 4ECh. 9.3 - Prob. 5ECh. 9.3 - Prob. 6ECh. 9.3 - Exercises 7 and 8 relate to a canonical linear...Ch. 9.3 - Prob. 9ECh. 9.3 - Prob. 10ECh. 9.3 - Prob. 11ECh. 9.3 - Solve Exercises 9-14 by using the simplex method....Ch. 9.3 - Solve Exercises 9-14 by using the simplex method...Ch. 9.3 - Solve Exercises 9-14 by using the simplex method....Ch. 9.3 - Solve Example 7 by bringing x1 into the solution...Ch. 9.3 - Use the simplex method to solve the linear...Ch. 9.3 - Prob. 17ECh. 9.3 - Use the simplex method to solve the linear...Ch. 9.4 - The following questions relate to the Shady-Lane...Ch. 9.4 - The following questions relate to the Shady-Lane...Ch. 9.4 - Prob. 3PPCh. 9.4 - Prob. 1ECh. 9.4 - Prob. 2ECh. 9.4 - Prob. 3ECh. 9.4 - In Exercises 1-4, state the dual of the given...Ch. 9.4 - In Exercises 5-8, use the final tableau in the...Ch. 9.4 - In Exercises 5-8, use the final tableau in the...Ch. 9.4 - In Exercises 5-8, use the final tableau in the...Ch. 9.4 - In Exercises 5-8, use the final tableau in the...Ch. 9.4 - Exercises 9 and 10 relate to a primal linear...Ch. 9.4 - Sometimes a minimization problem has inequalities...Ch. 9.4 - Sometimes a minimization problem has inequalities...Ch. 9.4 - Sometimes a minimization problem has inequalities...Ch. 9.4 - Sometimes a minimization problem has inequalities...Ch. 9.4 - Exercises 15 and 16 refer to Exercise 15 in...Ch. 9.4 - Exercises 15 and 16 refer to Exercise 15 in...Ch. 9.4 - Solve the matrix games in Exercises 17 and 18 by...Ch. 9.4 - Solve the matrix games in Exercises 17 and 18 by...Ch. 9.4 - Solve the matrix game in Exercise 9 in Section 9.1...Ch. 9.4 - Solve the matrix game in Exercise 10 in Section...Ch. 9.4 - Prob. 22ECh. 9.4 - Prob. 23E
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