Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 1 - Graphs - Chapter Review - Review Exercises - Page 42: 22

Answer

The slope of the line $4x-5y=-20$ is $\frac{4}{5}$. The $y-$ intercept of the line $4x-5y=-20$ is $(0,\,4)$. The graph of line is as shown below:

Work Step by Step

Convert to slope intercept form: $4x-5y=-20$ Subtract $4x$ on both sides, $-5y=-20-4x$ Multiply on both sides by $-1$, $5y=20+4x$ Divide on both sides by $5$, $y=\frac{20+4x}{5}$ $\Rightarrow y=\frac{20}{5}+\frac{4}{5}x$ $\Rightarrow y=\frac{4}{5}x+4$ By comparing $y=\frac{4}{5}x+4$ with the point-slope form $y=mx+c$, the coefficient of $x$ is $\frac{4}{5}$, and the constant is $4$. Therefore, the slope is $\frac{4}{5}$, and the $y-$ intercept is $4$. The $y-$ intercept is $4$. That means the point $\left( 0,4 \right)$ is on the line. The slope of the line is $\frac{4}{5}$. Move from $(0,4)$ 4 units up and 5 units right. Connect the points with a line.
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