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: 25

Answer

The value of slope is wrong. The correct equation of the line is $y=\frac{1}{4}x+\frac{11}{4}$

Work Step by Step

The given point is $(x_1,y_1)=(1,3)$. The given equation of the line is $\Rightarrow y=\frac{1}{4}x+2$ Slope of the line is $m=\frac{1}{4}$. Slope of the parallel line is $m=\frac{1}{4}$. The point-slope form is $\Rightarrow y-y_1=m(x-x_1)$ Substitute $\frac{1}{4}$ for $m,1$ for $x_1,$ and $3$ for $y_1$. $\Rightarrow y-3=\frac{1}{4}(x-1)$ Use distributive property. $\Rightarrow y-3=\frac{1}{4}x-\frac{1}{4}$ Add $3$ to each side. $\Rightarrow y-3+3=\frac{1}{4}x-\frac{1}{4}+3$ Simplify. $\Rightarrow y=\frac{1}{4}x+\frac{-1+12}{4}$ $\Rightarrow y=\frac{1}{4}x+\frac{11}{4}$ Hence, the value of slope is wrong. The correct equation of the line is $y=\frac{1}{4}x+\frac{11}{4}$
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