 # When Can We Reverse a Transformation? 1

##### This When Can We Reverse a Transformation? 1 lesson plan also includes:

Wait, let's start over — teach your class how to return to the beginning. The first instructional activity looking at inverse matrices introduces the concept of being able to undo a matrix transformation. Learners work with matrices with a determinant of one and set up a system of equations to find the appropriate inverse matrix.

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CCSS: Designed
##### Instructional Ideas
• Have the class members calculate the determinant of the matrix and its inverse to begin seeing a pattern
##### Classroom Considerations
• The class should be familiar with the Pythagorean identity for trigonometry
• Class members need to be able to solve systems of equations
• The lesson is the 29th installment in a unit of 32
##### Pros
• The answer key shows the systems of equations your class must solve
• The teacher notes provide anticipated responses to discussion questions
##### Cons
• Question one in the problem set asks for a description of a formula that has not be fully developed in the lesson