Equivalent Expressions and One Step Equations

expression

A math sentence that contains operations, numbers, and/or variables. No equal sign.

equation

A math sentence that has an equal sign.

term

A number, a variable, or the product of a number and a variable.

variable

A letter used to represent an unknown number.

constant

A number without a variable

coefficient

The number in front of the variable

inverse

opposite

inverse operation

The opposite or reverse operation.

inverse of addition

subtraction

inverse of subtraction

addition

inverse of division

multiplication

x + 5 = 10

x = 5

x - 7 = 9

x = 16

3x = 9

x = 3

12/x = 4

x = 3

order of operations

Operations are performed in this order: 1. parentheses 2. exponents 3. multiplication and division 4. addition and subtraction

PEMDAS

An acronym used to help remember the order of operations

P = parentheses, E = exponents, MD = Multiplication/Division, AS = Addition/Subtraction

equivalent

equal to

equivalent expressions

Expressions with the same value

to isolate

set apart from others

to isolate the variable

To get a variable alone on one side of the equation in order to solve the equation.