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Khan Academy
Khan Academy: Algebra: Systems of Three Variables 2
This video demonstrates how to solve a system comprised of three equations in three variables using elimination. [7:00]
Khan Academy
Khan Academy: Algebra Ii: Solutions to Three Variable System
This video demonstrates how to solve a system of equations with three variables in order to determine if the system has no solution or infinite solutions. The system is solved using the elimination method. [4:34]