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Linear Inequations

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Topics

  • Definition:  Linear lnequations 
  • Signs of Inequality
  • Definition: Replacement Set / Domain of Variable
  • Definition: Solution Set
  • Properties
CISCE: Class 10

Definition: Inequation

An inequation is a relation showing inequality between two quantities.

Symbols used:

  • > greater than

  • < less than

  •  greater than or equal to

  • less than or equal to

CISCE: Class 10

Definition: Linear Inequation in One Variable

An inequation involving one variable of degree 1 is called a linear inequation in one variable.

General forms:

  • ax + b > c

  • ax + b < c

  • ax + b 

  • ax + b 
    (where a, b, c are real numbers and a ≠ 0)

CISCE: Class 10

Definition: Replacement Set / Domain

The set from which values of the variable are taken is called the
replacement set or domain.

CISCE: Class 10

Definition: Solution Set

The set of all values from the replacement set that satisfy the inequality is called the solution set.

CISCE: Class 6

Key Points: Properties of Inequation

Operation on Both Sides Inequality Sign Example
Add the same number No change (x - 2 < 4 ⇒ x < 6)
Subtract the same number No change (x + 3 > 7 ⇒ x > 4)
× or ÷ by a positive number No change (x < 6 ⇒ 3x < 18)
× or ÷ by a negative number Reverses (-2x > 6 ⇒ x < -3)
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