Linear Equations in Linear Algebra. Linear Models in Economics and Engineering


TWO FUNDAMENTAL QUESTIONS ABOUT A LINEAR SYSTEM



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1 941-20 Abdullayev Artur 1-7

TWO FUNDAMENTAL QUESTIONS ABOUT A LINEAR SYSTEM

1. Is the system consistent; that is, does at least one solution exist?

2. If a solution exists, is it the only one; that is, is the solution unique?

These two questions will appear throughout the text, in many different guises. This section and the next will show how to answer these questions via row operations on the augmented matrix.



EXAMPLE 2 Determine if the following system is consistent:



SOLUTION This is the system from Example 1. Suppose that we have performed the row operations necessary to obtain the triangular form


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