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A linear equation is not always in the form y = 3.5 − 0.5x,It can also be like y = 0.5(7 − x)Or like y + 0.5x = 3.5Or like y + 0.5x − 3.5 = 0 and more.

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https://www.khanacademy.org/math/algebra-basics/alg-basics-systems-of-equations

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Tutorial Video

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Solving Systems of Equations... Substitution Method (NancyPi).MP4

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Worksheet