A linear equation is an algebraic equation in which each term is either a constant or the product of a constant and the first power of a single variable. Linear equations can have one or more variables.

Examples:

x = 3

2x - 3y = 17

x/2 - y/3 + z/4 = 1

A linear inequality meets all of the conditions met by a linear equation, except that the equal sign is replaced by an inequality symbol: <, ≤, >, or ≥.

Examples:

x ≤ 3

2x - 3y > 17

x/2 - y/3 + z/4 ≥ 1

A similar question was answered here.

Examples:

x = 3

2x - 3y = 17

x/2 - y/3 + z/4 = 1

A linear inequality meets all of the conditions met by a linear equation, except that the equal sign is replaced by an inequality symbol: <, ≤, >, or ≥.

Examples:

x ≤ 3

2x - 3y > 17

x/2 - y/3 + z/4 ≥ 1

A similar question was answered here.