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Identifying solutions to a system of linear equations

This demonstrates testing possible answers to a system of two equations to see whether they are truly answers or not. Note that each answer has to work for both equations, but if it doesn't…

From  Tom Grant 14 plays 0  

Identifying solutions to a two-step linear inequality in one variable

Demonstrating how to substitute several values for the variable in an inequality to see if they are valid solutions.

From  Tom Grant 21 plays 0