# Math Unit Two

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Variable, constant, algebraic expression, evaluate, equation, solution, inverse operations, expression.

### Constant

A quantity that does not change.

### Algebraic Expression

Something that contains one or more variables and may contain operation symbols.

### Evaluate

To ________ an algebraic expression, substitute a number for the variable and then find the value.

### Inverse Operations

Operations that undo each other. Addition and subtraction are ______ ________. If an equation contains addition, solve it by subtracting from both sides to "undo" the addition.

### Equation

An _______ is a mathematical statement that two expressions are equal. You can think of a correct equation as a balanced scale.

### Variable

A letter or symbol that represents a quantity that can change.

### Solution

Equations may contain variables. If a value for a variable makes an equation true, that value is a ______ of the equation.

### Expression

An equation can be solved, but an __________ can only be simplified.

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