(a)
To fill: The property of an augmented matrix of a system of linear equation.
(a)
Answer to Problem 3E
The leading variables in the augmented matrix of a system of linear equation with variables x, y and z are x and y.
Explanation of Solution
Given:
Augmented matrix
The augmented matrix of a system is written by the use of only coefficient and constants that appears in the equation.
For example,
Write the matrix in augmented form
The augmented form of this matrix is
The variable z can assigned any value. It is not a leading variable in the system.
The only leading variables in the system are x and y.
Thus, the leading variables in the system is x and y.
(b)
To check: Whether the system is inconsistent or dependent.
(b)
Answer to Problem 3E
The given system of augmented matrix is dependent in nature.
Explanation of Solution
Given:
Augmented matrix
The augmented matrix of a system is written by the use of only coefficient and constants that appears in the equation.
For example,
Write the matrix in augmented form
A system which has infinitely many solutions, and if it is not inconsistent, the variables in row-echelon form are not leading in nature is called as dependent variable.
If the row-echelon form contains a row that represent
Thus, the given system of augmented matrix with variables x,y and z is dependent in nature.
(c)
The solution for the system.
(c)
Answer to Problem 3E
The solution for the given system is
Explanation of Solution
Given:
Augmented matrix
For (I) row
For (II) row
As z is arbitrary it can take any value.
Take
Substitute
Thus, the equation for the above augmented matrix is
Chapter 10 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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