Substitution

Replacing a letter in an algebraic expression or formula with a given numerical value.

Replacing a letter with a given numerical value.

Replacing a letter with a number or expression.

A method that replaces a variable with an equal expression taken from another equation.

Replacing a variable in an expression or equation with a known value.

Replacing a variable in an expression or formula with a given numerical value.

Replacing a variable with an equal number or algebraic expression.