Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 12 - Exponential Functions and Logarithmic Functions - 12.3 Logarithmic Functions - 12.3 Exercise Set - Page 803: 39

Answer

The graph is shown below.

Work Step by Step

$y={{\log }_{10}}x$ Therefore, the function $y={{\log }_{10}}x$ can be written as $x={{10}^{y}}$. Substitute $y=0$ in $x={{10}^{y}}$: $\begin{align} & x={{10}^{0}} \\ & =1 \end{align}$ Substitute $y=1$ in $x={{10}^{y}}$: $\begin{align} & x={{10}^{1}} \\ & =10 \end{align}$ Substitute $y=2$ in $x={{10}^{y}}$: $\begin{align} & x={{10}^{2}} \\ & =100 \end{align}$ Substitute $y=-1$ in $x={{10}^{y}}$: $\begin{align} & x={{10}^{-1}} \\ & =\frac{1}{10} \end{align}$ Substitute $y=-2$ in $x={{10}^{y}}$: $\begin{align} & x={{10}^{-2}} \\ & =\frac{1}{{{10}^{2}}} \\ & =\frac{1}{100} \end{align}$ Tabulate the obtained values as shown below: $\begin{matrix} x & y \\ 0 & 1 \\ 1 & 10 \\ 2 & 100 \\ -1 & \frac{1}{10} \\ -2 & \frac{1}{100} \\ \end{matrix}$ Now, draw the graph of $y={{\log }_{10}}x$ by using the table:
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