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The relation (R={(x,y):x^2+y^2=9,\ x\in{-3,0,3},\ y\in{-3,0,3}}) is considered from (X) to (Y). Why is it not a function?

Answer and explanation

Correct answer: Because (x=0) has two images

The correct answer is option A: x=0 has two images. A relation is a function from X to Y only when every element of X has exactly one image in Y. Use x^2+y^2=9 and test the allowed values. For x=0, y^2=9, so y=3 or y=-3. Thus the same input 0 is related to two outputs, and the relation is not a function. For x=3, 9+y^2=9, so y=0 only; therefore option B is wrong. For x=-3, the same calculation gives y=0, so x=-3 does have an image; option C is wrong. Option D is wrong because the presence of 0 in Y does not by itself prevent a relation from being a function. What matters is the number of images for each input. Option A correctly identifies the failure of the one-input-one-output rule. Memory cue: in a function, each x gets one and only one y; different x-values may share a y, but one x cannot have two y-values.

Related tags

Circle RelationFunction TestUniqueness

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