MATH 1011 Lecture Notes - Lecture 2: Linear Equation, Rational Function

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blushclam842

23 Jan 2017

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Sections 1. 1 and 1. 2: linear equations and application. When solving a linear equation, we are looking for all values of x that when substituted back into the original equation yield a true statement. The goal is to find the values that satisfy the original equation regardless of the method. Step one is to find a common denominator 20. One way to find a denominator is to multiply all the denominators together. 40 and 80 are both common denominators, but we are looking for the lcd (least common denominator) which is 20. To find lcd look at all of the denominators and their prime factorizations. All of the primes to their highest powers without repeating numbers (all of the primes to the largest power to which they appear on the list of denominators). Multiply the entire equation by the lcd in order to get rid of the fractions in the problem.

Related Questions

question 23 please

A classical model in mathematical ecology is the LotkaâVolterra predator-prey model. Consider a simple ecosystem consisting of rabbits that have an infinite supply of food and foxes that prey on the rabbits for their food. This is modeled by a pair of nonlinear, first-order differential equations:

where t is time, r(t) is the number of rabbits, f(t) is the number of foxes, and Î± is a positive constant. If Î± = 0, the two populations do not interact, the rabbits do what rabbits do best, and the foxes die off from starvation. If Î± > 0, the foxes encounter the rabbits with a probability that is proportional to the product of their numbers. Such an encounter results in a decrease in the number of rabbits and (for less obvious reasons) an increase in the number of foxes. The solutions to this nonlinear system cannot be expressed in terms of other known functions; the equations must be solved numerically. It turns out that the solutions are always periodic, with a period that depends on the initial conditions. In other words, for any r(0) and f(0), there is a value t = t_p when both populations return to their original values. Consequently, for all t,

(a) Compute the solution with r₀ = 300, f₀ = 150, and Î± = 0.01. You should find that t_p is close to 5. Make two plots, one of r and f as functions of t and one a phase plane plot with r as one axis and f as the other.

(b) Compute and plot the solution with r₀ = 15, f₀ = 22, and Î± = 0.01. You should find that t_p is close to 6.62.

(c) Compute and plot the solution with r₀ = 102, f₀ = 198, and Î± = 0.01. Determine the period t_p either by trial and error or with an event handler.

(d) The point (r₀, f₀) = (1/Î±, 2/Î±) is a stable equilibrium point. If the populations have these initial values, they do not change. If the initial populations are close to these values, they do not change very much. Let u(t) = r(t)â1/Î± and v(t) = f(t) â 2/Î±. The functions u(t) and v(t) satisfy another nonlinear system of differential equations, but if the uv terms are ignored, the system becomes linear. What is this linear system? What is the period of its periodic solutions?

Hi, I need the full Matlab code and answers for all parts of the problem. Thanks!

This is a Project (Submit date: 2017/6/10)

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This Project is Related to and Part of "Linear Algabra and Differential Equations [Course]"