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Common Core · High School Algebra · Reasoning with Equations and Inequalities

Standard A.REI.C.9

Free lessons and printable worksheets aligned to Common Core math standard A.REI.C.9.

3 lessons2 worksheets

Lessons for A.REI.C.9

Inverse of a 2 by 2 matrix, and solving with itSwap, negate, divide by the determinant.Lesson
When a matrix or transformation can be undoneA matrix can be undone exactly when nothing but zero lands on zero, which is when its determinant is not zero.Lesson
MatricesRectangular arrays of numbers, with their own arithmetic.Lesson

Printable Worksheets

Inverse of a 2 by 2 matrix, and solving with it worksheet (PDF)Printable worksheet with answer keyPreview
When a matrix or transformation can be undone worksheet (PDF)Printable worksheet with answer keyPreview