COMEDK · Maths · 24. Functions

Consider the following list of ordered pairs: \((1, 0), (-2, -1), (7, -6), (-3, 4)\) and \((0, 2)\)
Which of the following options correctly identifies only those pairs that are NOT elements of the relation \(R = \{(x, y) : y = 1 - |x|\,;\, x, y \in \mathbb{Q}\}\)?

A \((-3, 4), (0, 2)\)
B \((0, 2), (-2, -1)\)
C \((1, 0), (-2, -1)\)
D \((-3, 4), (7, -6)\)

Verified Solution

Answer & Solution

Correct Answer

(A) \((-3, 4), (0, 2)\)

Step-by-step Solution

Detailed explanation

The given relation is \(R = \{(x, y) : y = 1 - |x|\,;\, x, y \in \mathbb{Q}\}\). Checking each ordered pair by substituting \(x\) into the equation \(y = 1 - |x|\): For \((1, 0)\): \(1 - |1| = 1 - 1 = 0 = y\). This belongs to \(R\). For \((-2, -1)\):…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Consider the following list of ordered pairs: \((1, 0), (-2, -1), (7, -6), (-3, 4)\) and \((0, 2)\)Which of the following options correctly identifies only those pairs that are NOT elements of the relation \(R = \{(x, y) : y = 1 - |x|\,;\, x, y \in \mathbb{Q}\}\)?

Step-by-step Solution

Consider the following list of ordered pairs: \((1, 0), (-2, -1), (7, -6), (-3, 4)\) and \((0, 2)\)
Which of the following options correctly identifies only those pairs that are NOT elements of the relation \(R = \{(x, y) : y = 1 - |x|\,;\, x, y \in \mathbb{Q}\}\)?