Answer
$m=\dfrac{y-y_1}{x-x_1}$
Work Step by Step
Divide both sides by $x-x_1$ to find:
$\dfrac{y-y_1}{x-x_1}=\dfrac{m(x-x_1)}{x-x_1}
\\\dfrac{y-y_1}{x-x_1}=m
\\m=\dfrac{y-y_1}{x-x_1}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 68: 61
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