Question

1. to replace a variable in a mathematical expression with an actual value

variable
2. a value of the variable that makes an algebraic sentence true
solution
3. a system for simplifying expressions that ensures that there is only one right answer
order of operations
4. a letter used to represent an unknown number or quantity
equation
5. a mathematical statement that shows two expressions are equal using an equal sign
substitute

Answer 1

what is the question so i can help you, i'm confused