Is there sufficient food to satisfy the average daily consumption?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Suppose that in a biological system there are n species of animals and m sources of food.
Let ï¿ represent the population of the jth species, for each j = 1, . . ., N;
let bi represent the available daily supply of the ith food;
and let aÿj represent the amount of the ith food consumed on average by a member of the jth species. The linear system
a11x1 + a12X2 +
+ A1n xn
b₁,
a21x1 + a22x2 +
+ A2n xn
: b2,
am1x1 + am 2x2 +
represents an equilibrium
A. Let A = [aij]
-
=
=
⠀
: bm
+ Amn Xn
where there is a daily supply of food to precisely meet the average daily consumption of each species.
=
1
2 0 3
=
"
1 0 2 2 X = (xj) = [1000, 500, 350, 400], and b
0 0 1 1
(bį) = [3500, 2700, 900].
Is there sufficient food to satisfy the average daily consumption?
(Hint: The linear system holds if Ax
b. We don't exactly need this, but think about how the entries in Ax should be compared to those of b.)
B. What is the maximum number of animals of species 1 that could be added to the system with the supply of food still meeting the consumption?
(i.e. How large can ₁ be?)
-
Transcribed Image Text:Suppose that in a biological system there are n species of animals and m sources of food. Let ï¿ represent the population of the jth species, for each j = 1, . . ., N; let bi represent the available daily supply of the ith food; and let aÿj represent the amount of the ith food consumed on average by a member of the jth species. The linear system a11x1 + a12X2 + + A1n xn b₁, a21x1 + a22x2 + + A2n xn : b2, am1x1 + am 2x2 + represents an equilibrium A. Let A = [aij] - = = ⠀ : bm + Amn Xn where there is a daily supply of food to precisely meet the average daily consumption of each species. = 1 2 0 3 = " 1 0 2 2 X = (xj) = [1000, 500, 350, 400], and b 0 0 1 1 (bį) = [3500, 2700, 900]. Is there sufficient food to satisfy the average daily consumption? (Hint: The linear system holds if Ax b. We don't exactly need this, but think about how the entries in Ax should be compared to those of b.) B. What is the maximum number of animals of species 1 that could be added to the system with the supply of food still meeting the consumption? (i.e. How large can ₁ be?) -
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