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If R = {(x, y): x = |y|, x ∈ {0, 1, 2}, y ∈ {−2, −1, 0, 1, 2}} is considered from X = {0, 1, 2} to Y = {−2, −1, 0, 1, 2}, what is R?

Answer and explanation

Correct answer: It is not a function because x = 1 has images y = −1 and y = 1.

To test whether R is a function from X to Y, each fixed x in X must be related to exactly one y in Y. The condition x=|y| gives the pairs (0,0), (1,−1), (1,1), (2,−2), and (2,2). In particular, the single input x=1 is related to two different outputs, −1 and 1. Therefore R fails the uniqueness requirement and is not a function from X to Y. Option B states this precise defect. Option A checks only existence and ignores uniqueness, option C is false because x=0 has y=0, and option D focuses on |y| without considering that one x can correspond to two y-values.

Related tags

Absolute ValueRelationFunction CriterionFinite SetsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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