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# Unit 4: Matrices

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## About this unit

Learn what matrices are and about their various uses: solving systems of equations, transforming shapes and vectors, and representing real-world situations. Learn how to add, subtract, and multiply matrices, and find the inverses of matrices.

### Practice

- Matrix dimensionsGet 3 of 4 questions to level up!
- Matrix elementsGet 3 of 4 questions to level up!

### Practice

- Represent linear systems with matricesGet 3 of 4 questions to level up!

### Practice

- Matrix row operationsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Practice

- Add & subtract matricesGet 3 of 4 questions to level up!
- Matrix equations: addition & subtractionGet 3 of 4 questions to level up!

### Practice

- Multiply matrices by scalarsGet 3 of 4 questions to level up!
- Matrix equations: scalar multiplicationGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Multiply matricesGet 3 of 4 questions to level up!

### Learn

### Learn

### Practice

- Use matrices to transform 3D and 4D vectorsGet 3 of 4 questions to level up!
- Transform polygons using matricesGet 3 of 4 questions to level up!
- Understand matrices as transformations of the planeGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Practice

- Determinant of a 2x2 matrixGet 3 of 4 questions to level up!

### Practice

- Determine inverse matricesGet 3 of 4 questions to level up!
- Determine invertible matricesGet 3 of 4 questions to level up!

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### Practice

- Find the inverse of a 2x2 matrixGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

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Level up on all the skills in this unit and collect up to 1,700 Mastery points!