Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 2 - Section 2.5 - The Point-Slope Form of the Equation of a Line - Exercise Set - Page 163: 7


Point-slope form: $y=-5(x+2)$ Function notation of the slope-intercept form: $f(x) =-5x-10$

Work Step by Step

RECALL: (i) The point-slope form of a line's equation is: $y-y_1=m(x-x_1)$ where m= slope and $(x_1, y_1)$ is a point on the line. (ii) The function notation of the slope-intercept form of a line's equation is: $f(x) = mx + b$ where m= slope and b = y-intercept The given line has $m=-5$ and passes through the point (-2, 0). This means that the point-slope form of the line's equation is: $y-0 = -5[x-(-2)] \\y=-5(x+2)$ Convert the equation to slope-intercept form by distributing $-5$ to obtain: $y =-5(x+2) \\y=-5\cdot x + (-5)\cdot 2 \\y=-5x+(-10) \\y=-5x-10$ In function notation, the slope-intercept form of the equation is: $f(x) = -5x-10$
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