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x = 6

x + 3 = 9

Subtracting

The opposite of adding.

x = 1

x - 11 = -10

Adding

Moving right/up on the number line.

Expressions

A mathematical statement that contains variable, constant and operation.

Equations

A mathematical statement that contains variables, constant, operations and equal sign.

x = -39

x + 23 = - 16

x = 9

x + 6 = 15

exponent

A mathematical notation indicating the number of times a quantity is multiplied by itself

Base

the number that is written with an exponent

Variable

an alphabetic character representing a number, called the value, which is either arbitrary or not fully specified or unknown. It is usually a letter like x or y.

constant

A quantity that does not change.

Evaluate

To find the value of a mathematical expression.

Answer: 13

Evaluate "3x - 2y" when x = 5 and y = 1

5 - x

Translate "a number x less than 5" in algebraic symbols.