This unit discusses systems of linear equations and their solutions.

### Solving Linear Systems by Graphing

by Sal Khan
This video shows how one can solve a system of linear equations by carefully graphing them and seeing where the lines intersect.
Curriki RatingNR

### Solving Linear Systems by Substitution

by Sal Khan
This video shows an algebraic technique for solving systems of equations. One solves for one variable and substitutes it into the second equation.
Curriki RatingNR

### Solving Systems of Equations by Elimination

by Sal Khan
This video shows a second algebraic technique for solving systems of equations: elimination. One works to eliminate one variable by combining two equations. In all these examples, the elimination requires but a single step.
Curriki RatingNR

### Solving Systems of Equations by Multiplication

by Sal Khan
This video extends the technique of elimination to include more complicated problems requiring multiplication.
Curriki RatingNR

### Special Types of Linear Systems

by Sal Khan
This video classifies systems of linear equations by whether they are consistent (unique solution), dependent (multiple solutions), or inconsistent (no solutions).
Curriki Rating3

### Systems of Linear Inequalities

by Sal Khan
This video tackles the problem of systems of simultaneous inequalities. Their solution can be shown graphically or algebraically.
Curriki Rating3

Non-profit Tax ID # 203478467