INEQUATIONS

  An inequation is an algebraic inequality:
    x + 3y < 7

  The variables that appear in these inequalities are also called unknowns. The degree of an inequation is the biggest degree of its unknowns.
  A solution of an inequation is a value that makes the inequality true. The solution of an inequation is the set of all the solutions.
 

  x = 7 is a solution of x + 3 > 0, and (-3,∞) is the solution of this inequation.