MATH

When we talk about algebraic foundations, we're mostly talking about understanding variables, expressions, and how to solve equations.

A variable is simply a letter, like x, y, or a, that stands in for an unknown number. We use variables when we want to talk about "some number" without knowing exactly what it is yet, or when a number can change.

An expression is a combination of numbers, variables, and operation signs (+, -, , /). It doesn't have an equals sign.
* Examples of expressions:* x + 5, 2y - 7, 3a/4, x^2