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 - 4.1-4.3 - Quiz - Page 194: 2

Answer

The slope-intercept form is $y=-\frac{1}{3}x+5$.

Work Step by Step

The given points are $(x_1,y_1)=(0,5)$ and $(x_2,y_2)=(3,4)$ Slope $\Rightarrow m=\frac{y_2-y_1}{x_2-x_1}$ Substitute all the values. $\Rightarrow m=\frac{4-5}{3-0}$ Simplify. $\Rightarrow m=-\frac{1}{3}$ The point-slope form $\Rightarrow y-y_1=m(x-x_1)$ Substitute $-\frac{1}{3}$ for $m,$ $0$ for $x_1$ and $5$ for $y_1$. $\Rightarrow y-5=-\frac{1}{3}(x-0)$ Use distributive property. $\Rightarrow y-5=-\frac{1}{3}x+0$ Add $5$ to each side. $\Rightarrow y-5+5=-\frac{1}{3}x+5$ Simplify. $\Rightarrow y=-\frac{1}{3}x+5$ Hence, the slope-intercept form is $y=-\frac{1}{3}x+5$.
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