Solving Linear Systems: Invertibility
http://www.maa.org/taxonomy/term/42326/0
enA Geometrical Approach to Cramer's Rule
http://www.maa.org/programs/faculty-and-departments/classroom-capsules-and-notes/a-geometrical-approach-to-cramers-rule
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><em>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.</em></p>
</div></div></div>Linear Algebra Toolkit
http://www.maa.org/programs/faculty-and-departments/course-communities/linear-algebra-toolkit-0
Matrix Online Calculator
http://www.maa.org/programs/faculty-and-departments/course-communities/matrix-online-calculator
Matrix Multiplier
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Matrix Calculator
http://www.maa.org/programs/faculty-and-departments/course-communities/matrix-calculator-1
Classroom Capsules and Notes for Solving Linear Systems: Invertibility in Linear Algebra
http://www.maa.org/programs/faculty-and-departments/course-communities/classroom-capsules-and-notes-for-solving-linear-systems-invertibility-in-linear-algebra