
To find: The solution to the given system of linear equations

Answer to Problem 86E
The solutions to the given system of equation are
Explanation of Solution
Given information: The system of equation is
Concept Involved:
Solution of a system of equation is the point which makes both the equation TRUE.
Graphically the solution to the system of equation is the point where the two lines meet.
A matrix derived from a system of linear equations (each written in standard form with the constant term on the right) is the augmented matrix of the system.
Elementary Row Operation:
The three operations that can be used on a system of linear equations to produce an equivalent system.
Operation | Notation |
1.Interchange two equations | |
2. Multiply an equation by a nonzero constant | |
3. Add a multiple of an equation to another equation. |
In matrix terminology, these three operations correspond to elementary row operations.
An elementary row operation on an augmented matrix of a given system of linear equations produces a new augmented matrix corresponding to a new (but equivalent) system of linear equations.
Two matrices are row-equivalent when one can be obtained from the other by a sequence of elementary row operations.
Calculation:
Write the system of equation
Multiply ½ with the first Row
Add -1 times the 1st row to the 2nd row
Add -1 times the 1st row to the 3rd row
Add -1 times the 1st row to the 4th row
Add -1 times the 2nd row to the 1st row
The corresponding system of equation is
Solving x in terms of y, you have
To write a solution of the system that does not use any of the three variables of the system, let
Conclusion:
So, the solution set can be written as an ordered triple of the form
Chapter 8 Solutions
Precalculus with Limits
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