(+) Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension 3 × 3 or greater). (+) Represent a system of linear equations as a single matrix equation in a vector variable. For example, find the points of intersection between the line y = -3x and the circle x2 + y2 = 3. Solve a simple system consisting of a linear equation and a quadratic equation in two variables algebraically and graphically. Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.

Prove that, given a system of two equations in two variables, replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions. By the end of this playlist, students will be able to understand and solve problems involving two-variable linear inequalities. The playlist is an excellent resource for students to review or study for a test or final.

These videos each cover specific topics and concepts learned in Algebra I classes. Teachers can use these videos to support their lesson plans and engage students.

This playlist consists of 8 videos all about two-variable linear inequalities.

Khan academy graphing linear equations