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Which of the following relations is not a function because the same value of x is associated with two different values of y?

Answer and explanation

Correct answer: {(2,5), (2,6), (3,7)}

In option A, the input x = 2 is associated with two different outputs, y = 5 and y = 6. Thus, it violates the defining condition of a function: every input must have exactly one output. In option B, different x-values share the same y-value, which is allowed, so it is a function. Exam tip: check whether any x-value is paired with more than one y-value.

Related tags

Relations And FunctionsFunctionsNot A FunctionInput OutputFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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