A letter that stands for an unknown number

Terms joined by + or − with no equals sign, like 3x + 2

A statement that two expressions are equal

The number in front of a letter, like 4 in 4y

A term with no letter in it, like 7 in x + 7

A statement that uses instead of =

A rule written with letters, like A = l × w

Algebra vocabulary

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Keyword	Match
Variable	A letter that stands for an unknown number
Expression	Terms joined by + or − with no equals sign, like 3x + 2
Equation	A statement that two expressions are equal
Coefficient	The number in front of a letter, like 4 in 4y
Constant	A term with no letter in it, like 7 in x + 7
Inequality	A statement that uses < or > instead of =
Formula	A rule written with letters, like A = l × w

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