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What is dependent and inconsistent system?

Updated: 4/28/2022
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10y ago

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Suppose we have two linear equations in two unknowns. If the equations are plotted on a rectangular grid, the graph will fit one of these scenarios:

1) The two lines cross each other (intersect).

2) The two lines don't cross - they are parallel lines

3) The two lines fall on top of each other - they're really the same line.

In case 3) the two lines are dependent - one can be changed into the other. In cases 1) and 2) we say the lines are independent.

If the pair of equations has a solution (one or more points in common) we say they are consistent ... cases 1) and 3). In case 2) the system is inconsistent; there is no solution.

To summarize:

1) Intersecting lines are consistent and independent.

2) Parallel lines are inconsistent and independent.

3) Coincident ["happen together"] lines are consistent and dependent.

*** A second order linear system CANNOT be both dependent and inconsistent.

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Q: What is dependent and inconsistent system?
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What happens when Cramer's rule is applied to dependent or inconsistent systems?

We call the coefficients of the variables in the system D, and we need to find the determinant of D. When D = 0, the system is either inconsistent or dependent. You need another method to solve it.


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How can you identify a dependent or inconsistent system by looking at an augmented matrix in reduced row echelon form?

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How many solutions does an inconsistent system of equations have?

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How many solutions does an inconsistent system have


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How many solutions does an inconsistent equation have?

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