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The relation R = {(x,y): x² + y² = 4, x ∈ {-2,0,2}, y ∈ {-2,0,2}} is considered from X to Y. Why is it not a function?

Answer and explanation

Correct answer: Because x = 0 has two images

The relation represents selected points on the circle x² + y² = 4. To test whether it is a function from X to Y, inspect the possible y-values for each x in X. When x = 0, the equation becomes y² = 4, so y = 2 or y = -2. Both values belong to Y, meaning the single input 0 has two distinct images. This violates the defining rule that a function must assign exactly one output to each input. Hence option A is correct. For x = 2 and x = -2, the equation gives y² = 0 and therefore only y = 0, so those inputs do not create the same problem. The presence of 0 in Y is valid and is not a reason for failure.

Related tags

Circle-RelationFunction-TestOrdered-PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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