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VARIABLES AND EXPRESSIONS
In this module you can learn what a variables and expressions are and how they are used in algebra.
The video above contains an explanation of variables.
The above video from Khan academy explains variables, expressions and equations.
Did you know?
There are no rules that determine what letter is used as a variable.
Variables always represent some value, even if that value is zero.
The number that comes just after "x" is not "y"; it is "x + 1".
Study and practice
Study the fundamentals of algebra
This site from cimt.plymouth.ac.uk contains text, practice questions and an online quiz for several basic algebra concepts including variables, simplifying expressions and writing formulae.
Read about variables
This page from purplemath explains what a variable actually is.
Use these search terms to find your own resources :
what is a variable algebra variables working with variables