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Terms

Terms

Determinant  - Of a 2×2 matrix:

A =    



detA = a1b2 - a2b1.
Of a 3×3 matrix:

A =    


detA = (a1b2c3 + b1c2a3 + c1a2b3) - (a3b2c1 + b3c2a1 + c3a2b1)
Cramer's Rule  -  Cramer's Rule states that:
x =
y =
z =
where D is the 3×3 coefficient matrix, and Dx, Dy, and Dz are each the result of substituting the constant column for one of the coefficient columns in D.