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Which of the following functions has a graph symmetric about the line \(y=x\)?

Answer and explanation

Correct answer: \(y=\frac{1}{x}\)

On swapping \(x\) and \(y\) in \(y=\frac{1}{x}\), we get \(x=\frac{1}{y}\), which rearranges to the same equation. Hence its graph is symmetric about \(y=x\); \(y=x^2\) is not. Exam tip: swap the variables to test this symmetry.

Related tags

Standard FunctionsGraph SymmetryReciprocal FunctionRelations And FunctionsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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