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 - 4.3 - Writing Equations of Parallel and Perpendicular Lines - Exercises - Page 191: 21

Answer

The equation of the perpendicular line is $ y=-\frac{1}{4}x+\frac{9}{4}$.

Work Step by Step

The given point is $(-3,3)$. The given equation of the line is $\Rightarrow 2y=8x-6$ Slope-intercept form is $\Rightarrow y=4x-3$ Slope of the line is $m=4$. Slope of the perpendicular line is $m=-\frac{1}{4}$. The slope-intercept form is $\Rightarrow y=mx+b$ Substitute $-\frac{1}{4}$ for $m,-3$ for $x,$ and $3$ for $y$. $\Rightarrow 3=-\frac{1}{4}(-3)+b$ Simplify. $\Rightarrow 3=\frac{3}{4}+b$ Subtract $\frac{3}{4}$ from each side. $\Rightarrow 3-\frac{3}{4}=\frac{3}{4}+b-\frac{3}{4}$ Simplify. $\Rightarrow \frac{12-3}{4}=b$ $\Rightarrow \frac{9}{4}=b$ The equation of the perpendicular line is $\Rightarrow y=-\frac{1}{4}x+\frac{9}{4}$.
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