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Simultaneous equations are two or more equations...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eCREDITS Animation \u0026 Design: Waldi Apollis Narration: Lucy Billings Script: Lucy Billings In this video, we are going to discover how to solve simultaneous equations by substitution. Simultaneous equations are two or more equations with two or more unknowns. They are called simultaneous because they must be solved at the same time. Elimination doesn’t always work…whereas substitution does - so we’ll learn how to substitute in this video. When we solve simultaneous equations, we may get one solution…Or if a quadratic is involved, we may get two solutions…And we might also get 2 solutions with a straight line and a circle... Before we start, we need to know what linear equations look like…They are equations with an ‘x’ and a ‘y’ in, or an ‘a’ and ‘b’, but no squared or cubed letters. Take your time with the algebra, and always double check your answer at the end. 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