University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 16 - Section 16.5 - Systems of Equations and Phase Planes - Exercises - Page 16-33: 11

Answer

The equilibrium points are $(\dfrac{c}{d},\dfrac{a}{b})$ and (0,0).

Work Step by Step

Here, we have $\dfrac{dx}{dt}=(a-by) x$ and $\dfrac{dy}{dt}=(-c+dx) x$ when $\dfrac{dx}{dt}=0$ Then, we get $y=\dfrac{a}{b}$ and $x=0$ Also, when $\dfrac{dy}{dt}=0$ Then, we get $x=\dfrac{c}{d}$ and $y=0$ Thus, we have the equilibrium points: $(\dfrac{c}{d},\dfrac{a}{b})$ and (0,0). The point (0,0) implies zero rabbits and foxes. This point is unstable and if we introduce a few rabbits, they will begin to grow exponentially.
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