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 - Lesson Check - Page 86: 1



Work Step by Step

RECALL: The slope-intercept form of a line's equation is $y=mx + b$, where m=slope and b=y-intercept. The line has a slope of -3, so $m=-3$. This means that the tentative equation of the line is $y=-3x+b$. The line passes through the point (1,-4), which means that the coordinates of this point satisfies the equation of the line. Substitute the x and y coordinates of the given point into the tentative equation above to have $y=-3x+b \\-4 = -3(1) + b \\-4 =-3 + b \\-4+3 = b \\-1=b.$ Thus, the equation of the line is $y=-3x-1$.
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