Khan Academy Systems of Equations
Join this series to learn about systems of equations! We will go through an introduction, the substitution method, equivalent systems, the elimination method, the number of solutions, and word problems.
This series is perfect for you if you're currently taking Algebra and feeling like you're missing something, or if you're taking pre-algebra and you want to set yourself up for success when you take Algebra.
Feel free to check out the Khan Academy unit here:
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:systems-of-equations