# A Geometrical Approach to Cramer's Rule

by J. W. Orr (Ireland)

Mathematics Magazine
February, 1989

Subject classification(s): Algebra and Number Theory | Linear Algebra | Systems of Linear Equations
Applicable Course(s): 3.8 Linear/Matrix Algebra

Motivated by the interpretation of a determinant of a $2 \times 2$ matrix as the area of a parallelogram, the author derives Cramer's rule geometrically.

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