3. Matrix word problem: prices
Sal shows how matrices can be used to efficiently represent data about the prices of toilet paper and toothpaste in two different cities.
5. Multiplying matrices by scalars
Sal defines what it means to multiply a matrix by a scalar (in the world of matrices, a scalar is simply a regular number).
6. Multiply matrices by scalars
Find the matrix that is a result of multiplying a given matrix by a given scalar.
7. Adding & subtracting matrices
Sal defines what it means to add or subtract matrices. He shows a few examples and discusses some important properties of matrix addition and subtraction.
8. Add & subtract matrices
Find the matrix that is the result of the addition or subtraction of two given matrices.