Answer
$m_{1}\approx \frac{2}{3}$
$m_{2}\approx -\frac{2}{5}$
Work Step by Step
To estimate the slope of the tangent lines you can count the squares from one approximated point to another, as demonstrated by the graph below.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 2 - Differentiation - 2.1 Exercises - Page 103: 2
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