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13 September, 08:33

How do you decide whether substitution is the best method to solve a system in three variables?

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  1. 13 September, 09:02
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    Select one equation and solve it for one of its variables.

    In the other equation, substitute for the variable just solved.

    Solve the new equation.

    Substitute the value found into any equation involving both variables and solve for the other variable.
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