Evaluating expressions where individual variable values are unknown | Algebra I | Khan Academy
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Working through a few examples where we need to evaluate an expression, but we don't know the individual variable values
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https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/exp_unknown_vars/e/expressions_with_unknown_variables?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI
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Missed the previous lesson?
https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/complicated_equations/v/equations-with-variables-on-both-sides?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI
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