Adding and subtracting polynomials of degree one | Algebra 1 (TX TEKS) | Khan Academy

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https://www.khanacademy.org/math/algebra-1-tx/x36b5a29ce1c3a684:linear-expressions-equations-and-inequalities/x36b5a29ce1c3a684:add-and-subtract-polynomials-of-degree-one/v/adding-and-subtracting-polynomials-of-degree-one

Expand previous knowledge of combining like terms to this new context with more than one variable.

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