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yy-intercept of the Graph of a Logarithmic Function

The graph of a basic logarithmic function, such as y=logaxy = \log_a x, has no yy-intercept. Because the domain of the function only includes strictly positive values (0,)(0, \infty), the input xx can never be zero, meaning the curve approaches the vertical yy-axis but never touches or crosses it.

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Updated 2026-05-25

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Intermediate Algebra @ OpenStax

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

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