(i) Numerical Inequalities:
Relationship between numbers.
(ii) Literal or Variable Inequalities:
Relationship between variables or a variable and a number.
(iii) Double Inequalities:
Relationship from two sides.
(iv) Strict Inequalities:
An inequality that uses the symboles or . The symbols and are not in used.
(v) Slack Inequalities:
An inequality that uses the symbols or
(vi) Linear Inequalities in One Variable:
An inequality that involves a linear function in one variable.
(vii) Linear Inequalities in Two Variables:
An inequality involves a linear function in two variables.