dx (Lake A) г(6 — а) — 7а dt dx (Lake B) x(6 – x) – 100x² dt Here x(t) denotes the fish population in hundreds at time t and the terms – 7.x and –100x? describe the intensity of fish removal due to fishing. For the purpose of studying the differ- ential equations we allow x(t) to take negative values. (i) Determine the equilibrium points of each model and classify each of them as stable or unstable. Sketch several graphs of solutions to the differential equation from Lake A. (ii) In which of the two lakes is fishing viable? Explain carefully.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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dx
(Lake A)
г(6 — а) — 7а
dt
dx
(Lake B)
x(6 – x) – 100x²
dt
Here x(t) denotes the fish population in hundreds at time t and the terms – 7.x and –100x?
describe the intensity of fish removal due to fishing. For the purpose of studying the differ-
ential equations we allow x(t) to take negative values.
(i) Determine the equilibrium points of each model and classify each of them as stable or
unstable. Sketch several graphs of solutions to the differential equation from Lake A.
(ii) In which of the two lakes is fishing viable? Explain carefully.
Transcribed Image Text:dx (Lake A) г(6 — а) — 7а dt dx (Lake B) x(6 – x) – 100x² dt Here x(t) denotes the fish population in hundreds at time t and the terms – 7.x and –100x? describe the intensity of fish removal due to fishing. For the purpose of studying the differ- ential equations we allow x(t) to take negative values. (i) Determine the equilibrium points of each model and classify each of them as stable or unstable. Sketch several graphs of solutions to the differential equation from Lake A. (ii) In which of the two lakes is fishing viable? Explain carefully.
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