Example

Example 10.22: Graphing y=log2xy = \log_2 x

To graph the logarithmic function y=log2xy = \log_2 x, first convert the equation into its corresponding exponential form, 2y=x2^y = x. Next, use point plotting by selecting values for yy and calculating the resulting xx-values. For example, choosing yy-values of 2-2, 1-1, 00, 11, 22, and 33 produces the corresponding xx-values 14\frac{1}{4}, 12\frac{1}{2}, 11, 22, 44, and 88. Plotting these ordered pairs—(14,2)\left(\frac{1}{4}, -2\right), (12,1)\left(\frac{1}{2}, -1\right), (1,0)(1, 0), (2,1)(2, 1), (4,2)(4, 2), and (8,3)(8, 3)—creates the distinct curve of a logarithmic graph where the base is greater than one (a>1a > 1).

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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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