Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 11: Parametric Equations and Polar Coordinates - Practice Exercises - Page 687: 12

Answer

a) $x=t; y=3t-5; -\infty \lt t \lt \infty$ b) $x=3\cos t+1; y=3\sin t-2; 0 \leq t \leq 2 \pi$ c) $x=t; y=4t^2-t; -\infty \lt t \lt \infty$ d) $x=2 \cos t; y=3 \sin t; 0\leq t \leq 2 \pi$

Work Step by Step

(a) consider $(y+2)=3(x-1)$ or, $y=3x-5$ Hence, the parametric equations becomes: $x=t; y=3t-5; -\infty \lt t \lt \infty$ (b) consider $x-1=(3) \cos t; (y+2)=(3) \sin t $ Hence, the parametric equations becomes: $x=3\cos t+1; y=3\sin t-2; 0 \leq t \leq 2 \pi$ (c) consider $y=(4x^2-x) $ Hence, the parametric equations becomes: $x=t; y=4t^2-t; -\infty \lt t \lt \infty$ (d) consider $(\dfrac{x^2}{4})+(\dfrac{y^2}{9})=1 $ Hence, the parametric equations becomes: $x=2 \cos t; y=3 \sin t; 0\leq t \leq 2 \pi$
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