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System of 3 Equations, 3 Unknowns Using Substitution - Basic Example

Solving a System of 3 Equations, 3 Unknowns Using Substitution - Basic Example. In this example, most of the work is already done for us. All we have to do is substitute in our known value to find the other values. In general, we would like to take a system of equations and algebraically manipulate it so that we create a system as shown at the beginning of the video and proceed as in this example.
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