Example

Example 10.23: Graphing y=log13xy = \log_{\frac{1}{3}} x

To graph the logarithmic function y=log13xy = \log_{\frac{1}{3}} x, we first rewrite the equation into its equivalent exponential form, (13)y=x\left(\frac{1}{3}\right)^y = x. Next, we use point plotting by selecting a set of values for yy to calculate the corresponding xx-values. By choosing yy-values of 2-2, 1-1, 00, 11, 22, and 33, we obtain the ordered pairs (9,2)(9, -2), (3,1)(3, -1), (1,0)(1, 0), (13,1)\left(\frac{1}{3}, 1\right), (19,2)\left(\frac{1}{9}, 2\right), and (127,3)\left(\frac{1}{27}, 3\right). Plotting these specific coordinates on a Cartesian plane and connecting them creates the distinct curve of the logarithmic function.

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Updated 2026-05-26

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