Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 2 - Functions, Equations, and Graphs - 2-4 More About Linear Equations - Practice and Problem-Solving Exercises - Page 86: 34

Answer

$$y=\dfrac{2}{3}x+\dfrac{44}{3}$$

Work Step by Step

Recall: (1) Parallel lines have the same or equal slopes. (2) Perpendicular lines have slopes whose product is $-1$. (3) The slope-intercept form of a line's equation is $y=mx+b$ where $m$ is the slope and $b$ is the $y$-intercept. The line is parallel to $2x-3y=-3$, whose slope is $\frac{2}{3}$. This means that the slope of the line we are looking for is also $\frac{2}{3}$. Thus, the tentative equation of the line is: $$y=\frac{2}{3}x+b$$ Substitute $-7$ to $x$ and $10$ to $y$ to obtain: \begin{align*} y&=\frac{2}{3}x+b\\\\ 10&=\frac{2}{3}(-7)+b\\\\ 10&=\frac{-14}{3}+b\\\\ 10+\frac{14}{3}&=b\\\\ \frac{44}{3}&=b \end{align*} Thus, the equation of the line is: $$y=\dfrac{2}{3}x+\dfrac{44}{3}$$
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