Linear Algebra: A Modern Introduction
4th Edition
ISBN: 9781285463247
Author: David Poole
Publisher: Cengage Learning
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Textbook Question
Chapter 2.4, Problem 20EQ
For Exercises 19 and 20, determine the currents for the given electrical networks.
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3. Write a system of linear equations in slope intercept form that has exactly one solution at
the point (3, 4), such that one line has positive slope (but not 1) and the other line has
negative slope (but not "1).
Also write your system of equations with both
equations written in standard form with out
any fractions
8-
7
8
5
4
3
-2-
+
-8-7-6-5-4-3-2-1
1 2
3
-1
2
-
°
4
-5
-
-8
2. Write a system of linear equations in slope-intercept form has exactly one solution at the
point (3, 4), such that both lines have negative slope (but neither one has slope of 1).
Also write your system of equations with
both equations written in standard form
without any fractions.
B
0
5
4
3
-2
1
-8-7-6-5-4-3-2 -1
12
3
-1
2
-3
-5
6
-7
-8
4. Write a system of linear equations in slope-intercept form that has no solution, such that
(3, 4), and (3,8) are solutions to the first equation, and (0, 4) is a solution to the second
equation.
Also write your system of equations with both
equations written in standard form with out any
fractions
B
0
5
4
3
-2
+
-8-7-6-5-4-3-2
-1
|-
1 2 3
-1
2
-3
4
-5
6
-7
Chapter 2 Solutions
Linear Algebra: A Modern Introduction
Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 1-6, determine which equations are...Ch. 2.1 - In Exercises 7-10, find a linear equation that has...Ch. 2.1 - In Exercises 7-10, find a linear equation that has...Ch. 2.1 - In Exercises 7-10, find a linear equation that has...Ch. 2.1 - In Exercises 7-10, find a linear equation that has...
Ch. 2.1 - Prob. 11EQCh. 2.1 - In Exercises 11-14, find the solution set of each...Ch. 2.1 - In Exercises 11-14, find the solution set of each...Ch. 2.1 - In Exercises 11-14, find the solution set of each...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - In Exercises 19-24, solve the given system by back...Ch. 2.1 - The systems in Exercises 25 and 26 exhibit a lower...Ch. 2.1 - The systems in Exercises 25 and 26 exhibit a lower...Ch. 2.1 - Find the augmented matrices of the linear systems...Ch. 2.1 - Find the augmented matrices of the linear systems...Ch. 2.1 - Find the augmented matrices of the linear systems...Ch. 2.1 - Prob. 30EQCh. 2.1 - In Exercises 31 and 32, find a system of linear...Ch. 2.1 - Prob. 32EQCh. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 1-8, determine whether the given...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - In Exercises 9-14, use elementary row operations...Ch. 2.2 - 15. Reverse the elementary row operations used in...Ch. 2.2 - 16. In general, what is the elementary row...Ch. 2.2 - Prob. 17EQCh. 2.2 - In Exercises 17 and 18, show that the given...Ch. 2.2 - 19. What is wrong with the following “proof” that...Ch. 2.2 - What is the net effect of performing the following...Ch. 2.2 - Students frequently perform the following type of...Ch. 2.2 - Consider the matrix A=[2314]. Show that any of the...Ch. 2.2 - What is the rank of each of the matrices in...Ch. 2.2 - Prob. 24EQCh. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.2 - In Exercises 25-34, solve the given system of...Ch. 2.3 - In Exercises 1-6, determine if the vector is a...Ch. 2.3 - In Exercises 1-6, determine if the vector is a...Ch. 2.3 - In Exercises 1-6, determine if the vector is a...Ch. 2.3 - In Exercises 1-6, determine if the vector vis a...Ch. 2.3 - In Exercises 1-6, determine if the vector is a...Ch. 2.3 - In Exercises 7 and 8, determine if the vector b is...Ch. 2.3 - Show that 3=span([101],[110],[011])Ch. 2.3 - Use the method of Example 2.23 and Theorem 2.6 to...Ch. 2.3 - Use the method of Example 2.23 and Theorem 2.6 to...Ch. 2.3 - Use the method of Example 2.23 and Theorem 2.6 to...Ch. 2.4 - 1. Suppose that, in Example 2.27, 400 units of...Ch. 2.4 - 2. Suppose that in Example 2.27, 400 units of food...Ch. 2.4 - A florist offers three sizes of flower...Ch. 2.4 - 4. (a) In your pocket you have some nickels,...Ch. 2.4 - 5. A coffee merchant sells three blends of coffee....Ch. 2.4 - Redo Exercise 5, assuming that the house blend...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - In Exercises 7-14, balance the chemical equation...Ch. 2.4 - For Exercises 19 and 20, determine the currents...Ch. 2.4 - For Exercises 19 and 20, determine the currents...Ch. 2.4 - 21. (a) Find the currents in the bridge circuit...Ch. 2.4 -
22. The networks in parts (a) and (b) of Figure...Ch. 2.4 -
23. Consider a simple economy with just two...Ch. 2.4 - Suppose the coal and steel industries form a...Ch. 2.4 -
25. A painter, a plumber, and an electrician...Ch. 2.4 -
31. In Example 2.35, describe all possible...Ch. 2 - What is the maximum rank of a 53 matrix? What is...
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- Show how you can solve the system of equations by manipulating the algebra tiles while maintaining the balances. On this side of the page, use the addition (elimination) method. Keep track of what you did at each step by writing down the corresponding equivalent equations, as well as what you did to go from one equation to the next. 1. x + 2y = 5 x-2y=1 2. 2x+y=2 x-2y= 6arrow_forwarde) x24 1) Which of these are equivalent to x³? For each expression that is equivalent to x², prove it by using the definition of exponents. For each that is not equivalent to x³, give an example using a specific value for x that shows that it represents a different number. a) (x5) d) f) 10-2 b) (x²) *|*arrow_forwardNow show how you can solve the system of equations by manipulating the algebra tiles while maintaining the balances, using the substitution method. Keep track of what you did at each step by writing down the corresponding equivalent equations, as well as what you did to go from one equation to the next. Δ 1. x + 2y = 5 x-2y=1 2. 2x + y = 2 x-2y= 6arrow_forward
- 1. Write a system of two linear equations in slope-intercept form that has exactly one solution at the point (3, 4), such that both lines have positive slope (but neither one has slope of 1) Also write your system of equations with both equations written in standard form without any fractions. 8- 7 8 5 4 3 -2- + -8-7-6-5-4-3-2-1 1 2 3 -1 2 - 4 -5 -7 -8arrow_forwardThe original idea for creating this applet comes from Steve Phelps' Graph the Line applet. Directions: 1) Examine the equation shown on the right side of the screen. 2) Reposition the 2 big points so that the line is the graph of the displayed equation. 3) Click the "Check Answer" checkbox to check. If you're correct, the app will inform you. If you're not, you'll know this as well. If you're not correct, keep trying until you position the gray line correctly. 4) After correctly graphing the line, click the "Generate New Line" button.arrow_forwardProblem 1 & 2 answers 1. One diagonal has 11 squares, then total square in total for two diagonal line is 11 + 11 - 1 = 21 . 2. Each part has 5 squares.(except middle)Multiply by 4: 5 × 4 = 20.Add the middle square: 20 + 1 = 21.arrow_forward
- 2. Now Figure out a different way you could determine how many squares there are in the figure, again without counting them all one-by-one. Briefly describe this other method:arrow_forward1. Without counting all of the squares one by one, determine how many squares there are in the figure shown. Briefly describe your method.arrow_forward54, and 68 e Problem (10 point. in standard form (a + bi): 2+i √√3-2i ksgiving Problem (2 ion to reveal Mr. Erdman's favoriarrow_forward
- 1 2 5. Let S = 0 0 statements is true? and consider the subset W = {A Є M22 | SA = AS}. Which one of the following A. W is not a subspace of M22 = 4 B. W is a subspace of M22, and dim W C. W is a subspace of M22, and dim W = 3 D. W is a subspace of M22, and dim W = 2 E. W is a subspace of M22, and dim W = 1 F. W is a subspace of M22, and dim W = 0arrow_forwardA tablet computer has a 1 inch border of plastic around the screen. What is the area of the plastic border?arrow_forwardPlease answer with the correct answer only for each question.arrow_forward
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