If R(A)≠r[A;b]then the system is =---------
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Matrix method: If AX = B, then X = A-1B gives a unique solution, provided A is non-singular.But if A is a singular matrix i.e., if |A| = 0, then the system of equation AX = B may be consistent with infinitely many solutions or it may be inconsistent
Rank method for solution of Non-Homogeneous system AX = B
Write down A, B
Write the augmented matrix [A : B]
Reduce the augmented matrix to Echelon form by using elementary row operations.
Find the number of non-zero rows in A and [A : B] to find the ranks of A and [A : B] respectively.
If ρ(A) ≠ ρ(A : B) then the system is inconsistent.
ρ(A) = ρ(A : B) = the number of unknowns, then the system has a unique solution.
ρ(A) = ρ(A : B) < number of unknowns, then the system has an infinite number of solutions.
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