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With conventional linear algebra texts, the path is comparatively effortless for college kids through the early levels as fabric is gifted in a well-known, concrete atmosphere. besides the fact that, while summary thoughts are brought, scholars frequently hit a wall. teachers appear to agree that sure strategies (such as linear independence, spanning, subspace, vector area, and linear ameliorations) will not be simply understood and require time to assimilate. those thoughts are basic to the examine of linear algebra, so scholars' figuring out of them is essential to learning the topic. This textual content makes those suggestions extra obtainable through introducing them early in a well-recognized, concrete Rn surroundings, constructing them progressively, and returning to them during the textual content in order that once they are mentioned within the summary, scholars are easily capable of understand.

 

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Suppose each matrix represents the augmented matrix for a system of linear equations. In each case, determine if the system is consistent. If the system is consistent, determine if the solution is unique. 2 three 15. a. four zero zero 2 zero b. four zero zero zero zero zero zero zero zero five three zero five 19. x1 C hx2 D 2 4x1 C 8x2 D ok 20. x1 3x2 D 1 2x1 C hx2 D okay 21. a. In some cases, a matrix may be row reduced to more than one matrix in reduced echelon form, using different sequences of row operations. b. The row reduction algorithm applies only to augmented matrices for a linear system. c. A easy variable in a linear procedure is a variable that corresponds to a pivot column in the coefficient matrix. d. Finding a parametric description of the solution set of a linear system is the same as fixing the system. e. If one row in an echelon form of an augmented matrix is Œ zero zero zero five zero , then the associated linear system is inconsistent. 22. a. The reduced echelon form of a matrix is unique. b. If every column of an augmented matrix contains a pivot, then the corresponding system is consistent. c. The pivot positions in a matrix depend on whether row interchanges are used in the row reduction process. d. A general solution of a system is an explicit description of all solutions of the system. e. Whenever a system has free variables, the solution set contains many solutions. 23. Suppose the coefficient matrix of a linear system of four equations in four variables has a pivot in each column. Explain why the system has a unique solution. 24. Suppose a system of linear equations has a three five augmented matrix whose fifth column is not a pivot column. Is the system consistent? Why (or why not)? True/false questions of this type will appear in many sections. tools for justifying your answers were described before Exercises 23 and 24 in part 1. 1. four 1. 2 25. Suppose the coefficient matrix of a system of linear equations has a pivot position in every row. Explain why the system is constant. 26. Suppose a three five coefficient matrix for a system has three pivot columns. Is the system consistent? Why or why not? 27. Restate the last sentence in Theorem 2 using the concept of pivot columns: “If a linear system is consistent, then the solution is unique if and only if . ” 28. What would you have to know about the pivot columns in an augmented matrix in order to know that the linear system is consistent and has a unique solution? 29. A system of linear equations with fewer equations than unknowns is sometimes called an underdetermined system. Can such a system have a unique solution? clarify. 30. Give an example of an inconsistent underdetermined system of two equations in three unknowns. 31. A system of linear equations with more equations than unknowns is sometimes called an overdetermined system. Can such a system be consistent? Illustrate your answer with a specific system of three equations in two unknowns. 32. Suppose an n . n C 1/ matrix is row reduced to reduced echelon shape. nearly what fraction of the overall number of operations (flops) is involved in the backward phase of the reduction when n D 20?

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