Chapter 4 Goals

[4.1] Know how to write the size of a matrix
Know how to add and subtract matrices
Know when you can or can’t add/subtract matrices
Know how to multiply a matrix by a scalar
Tutorial | Solutions

[4.2] Know how to multiply matrices by hand
Know when you can or can’t multiply matrices
Know that the order of multiplication matters. A*B isn’t the same as B*A.
Tutorial 1 | Solutions
Tutorial 2 | Solutions

[4.4] Know how to find the determinant of a 2x2 matrix by hand (Section 4.3)
Know what the Identity matrix is and show examples of different sizes. (Section 4.4)
Know how to find the inverse of a 2x2 matrix by hand. (Section 4.4)
Tutorial | Solutions

[4.5] Know how to write a system of equations in matrix form
Know how to solve a system of equations using matrix inverses
Tutorial 1 | Solutions
Tutorial 2 | Solutions