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Point (1a,1)(\frac{1}{a}, -1) on the Graph of a Logarithmic Function

The graph of every basic logarithmic function y=logaxy = \log_a x consistently contains the point (1a,1)(\frac{1}{a}, -1). This geometric relationship is valid because the logarithmic equation 1=loga1a-1 = \log_a \frac{1}{a} is mathematically equivalent to the exponential equation a1=1aa^{-1} = \frac{1}{a}, which holds perfectly true for any base aa according to the algebraic rules of negative exponents.

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Updated 2026-05-25

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Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax

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