Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Section 2.7 - Polynomial and Rational Inequalities - Exercise Set - Page 415: 110

Answer

point-slope form $y-5=4(x+2)$ slope-intercept form $y=4x+13$ general form $4x-y+13=0$

Work Step by Step

Step 1. Since the line is perpendicular to $y=-\frac{1}{4}+\frac{1}{3}$, which has a slope of $m_2=-\frac{1}{4}$, we see that the slope $m_1$ of the unknown line satisfies $m_1m_2=-1$, which gives $m_1=4$ Step 2. As the line passes through $(-2,5)$, we can write the point-slope form as $y-5=4(x+2)$ Step 3. Rewrite the above equation: we have $y=4x+8+5$ or $y=4x+13$, which gives the slope-intercept form. Step 4. Rewrite the above equation as $4x-y+13=0$ to obtain the general form.
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