# pre-algebra vocab. chpt 1

## 20 terms

### algebraic expression

The expression 2 x n is called an algebraic expression because it contains a variable, a number, and at least one operation.

### equation

mathematical sentence containing two expressions separated by an equals sign (=)

### define a variable

by assigning a variable to represent the unknown quantity

### conjecture

make an educated guess

### algebra

The branch of mathematics that involves expressions with variables

### evaluate

find the value of an algebraic expression

### order of operations

find the value of the expression

### counterexample

an example that shows that a conjecture is false

### numerical expression

one with only numbers and operations

### integer

is any number from the set

### coordinate

the number that corresponds to a point

### inequality

a mathematical sentence indicating that two quantities are not equal; inequalities contain symbols like < and >

### absolute value

the distance between a number and 0 on a number line

### opposites

two numbers with the same absolute value but different signs

an integer and its opposite

### solve

you are finding the values of the variable that make the equation true

values solved

### inverse operations

"undo" each other

### powers

represent repeated multiplication (7
7 squared or 7 x 7

### variable

symbol, usually a letter, used to represent a number