14:41 Substitution
Maths Genie walks through substituting positive and negative numbers into expressions, thorough and exam-focused.
Algebraic substitution
Substitute values into formulae and expressions
5 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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5 shown 14:41 
6:23 Substitution | GCSE Maths
Corbettmaths clearly explains substituting values into expressions, with linked practice questions to try.
9:29 Substitution (Higher & Foundation) | GCSE Maths Tutor
Foundation and Higher substitution techniques for putting values into expressions and formulae.
3:48 Algebra: Substitution in Maths
Neatly chaptered guide covering one variable, two variables, and repeated variables, then practice questions.
5:27 Algebra Substitution - GCSE Maths
Builds from basic to trickier substitution examples, clearly spoken and well paced for GCSE.