Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 3 - Section 3.1 - Derivatives of Polynomials and Exponential Functions - 3.1 Exercises - Page 181: 60

Answer

The line parallel to $3x-y=5$ that is tangent to the curve is $y=3x-6 \ln3 +7$ at the point $(1.1, 3.7)$ or exactly $(\ln3, 7-3\ln3)$.

Work Step by Step

We can find the equation of the tangent line by first finding the derivative of the curve. This equation is $y=2e^x-3x$. Plugging in $3x-y=5$'s slope of $3$ for $y$ in this new equation gives us the x-coordinate at which the original curve's slope is $3$. This x-coordinate is $\ln3$. We can now plug this x-coordinate into the original curve's equation to find the y-coordinate of $7-3\ln3$. So the point where the line parallel to $3x-y=5$ is tangent to the curve is $(\ln3, 7-3\ln3)$.
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