Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 2 - Section 2.3 - Writing Equations of Lines - 2.3 Exercises: 39

Answer

$\text{slope-intercept form: } y=-2x+18 \\\\ \text{standard form: } 2x+y=18$

Work Step by Step

Using $y-y_1=m(x-x_1)$ or the point-slope form of linear equations, the equation of the line passing through $( 5,8 )$ and with a slope of $m= -2 $ is \begin{array}{l}\require{cancel} y-8=-2(x-5) .\end{array} In the form $y=mx+b$, the equation above is equivalent to \begin{array}{l}\require{cancel} y-8=-2x+10 \\\\ y=-2x+10+8 \\\\ y=-2x+18 .\end{array} In the form $Ax+By=C$, the equation above is equivalent to \begin{array}{l}\require{cancel} y=-2x+18 \\\\ 2x+y=18 .\end{array} Hence, the different forms of the equation of the line with the given conditions are \begin{array}{l}\require{cancel} \text{slope-intercept form: } y=-2x+18 \\\\ \text{standard form: } 2x+y=18 .\end{array}
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