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The relation \(R=\{(x,y): y^2=x,\ x\in X,\ y\in Y\}\) is defined from \(X=\{1,4,9\}\) to \(Y=\{-3,-2,-1,1,2,3\}\). Why is this relation not a function?

Answer and explanation

Correct answer: Because \(4\) has two images

For \(y^2=4\), both \(y=2\) and \(y=-2\) are possible. Thus, the input \(4\) has two images. A function must assign exactly one image to every input, so this relation is not a function. Exam tip: To test a relation, check whether the same first component is paired with two different second components.

Related tags

RelationsFunctionsFunction TestSquare RootsRelations And FunctionsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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