NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 7: Algebra - Multiple Choice Questions
Question 4

Question.  4

Which of the following is an equation?

(A)

x + 1

(B)

x – 1

(C)

x – 1 = 0

(D)

x + 1 > 0

Detailed Answer with Explanation:

  1. Key idea: An equation always has an equals sign.
    Example: (2 + 3 = 5)
  2. Check option A: (x + 1)
    This is just an expression.
    No equals sign → Not an equation.
  3. Check option B: (x - 1)
    This is also an expression.
    No equals sign → Not an equation.
  4. Check option C: (x - 1 = 0)
    This has an equals sign.
    It shows two sides are equal → Yes, this is an equation.
  5. Check option D: (x + 1 > 0)
    This has a greater than sign.
    That makes it an inequality, not an equation.
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