1. Two real numbers or two algebraic expressions related by the symbols <, >, ≤ or ≥ form an  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo.
2. An inequality is said to be  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo, if each variable occurs in first degree only and there is no term involving the product of the variables.
3. If a and b are real numbers, such that a<b, then the set of all real numbers x such that a ≤ x ≤ b is called a  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo interval.
4. If a and b are real numbers, such that a<b, then the set of all real numbers x such that a < x < b is called a  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo interval.
5. The values of x, which make an inequality a true statement, are called  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo of the inequality.
6. If the origin satisfies the inequality of the half of the half plane, then the half plane contains the  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo.
7. A line divides the plane in  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo half planes.
8. The points of the enclosed area of the shaded portion are the  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo of the given system of inequality.
9. When both sides are multiplied (or divided) by a negative number, then the inequality is  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo.
10. Equal numbers may be  addedclosedinequalitylinearopenoriginreversedsolutionsolutionstwo to (or subtracted from ) both sides of an inequality.