Intro to variables, algebraic expressions, and equations

Evaluating Algebraic expressions

Variables: a letter that represents a number

Algebraic expression/ just expression: a combination of operations on variables and numbers

if two variables or a number and variable are next to each other, with no operation sign between them, the operation is multiplication

Ex:

2x=2\cdot x

Evaluating the expression: is replacing a variable in an expression by a number and then finding the value of the expression