Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 4 - Writing Linear Functions - 4.2 - Writing Equations in Point-Slope Form - Exercises - Page 185: 13

Answer

$y=-\frac{1}{2}x+1$

Work Step by Step

Let $(x_{1},y_{1})=(-6,4)$ and $(x_{2},y_{2})=(-2,2)$ The slope of the line is $m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}=\frac{2-4}{-2-(-6)}=\frac{-2}{4}=-\frac{1}{2}$ We can write the equation of a line using the value of slope $m=-\frac{1}{2}$ and the point $(-6,4)$. $y-y_{1}=m(x-x_{1})$ $\implies y-4=-\frac{1}{2}(x-(-6))$ $\implies y=-\frac{1}{2}(x+6)+4$ $\implies y=-\frac{1}{2}x-3+4$ $\implies y=-\frac{1}{2}x+1$
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