Simultaneous Equations by Substitution | Algebra | Maths | FuseSchool
CREDITS
Animation & Design: Waldi Apollis
Narration: Lucy Billings
Script: Lucy Billings
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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. Substitution will always work, whereas elimination won’t always. Which is why some people choose to use substitution for any simultaneous equations, even if they are easy linear ones.
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