Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 2 - Differentiation - Section Project - Optical Illusions: b

Answer

$\dfrac{dy}{dx}=-4.$

Work Step by Step

$\dfrac{d}{dx}(xy)=\dfrac{d}{dx}(C)\rightarrow$ $y+\dfrac{dy}{dx}(x)=0\rightarrow\dfrac{dy}{dx}=-\dfrac{y}{x}.$ When $x=1$ and $y=4\rightarrow\dfrac{dy}{dx}=-\dfrac{4}{1}=-4.$
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