Algebra 2
Algebra 2
1st Edition
ISBN: 9780078884825
Author: McGraw-Hill/Glencoe
Publisher: Glencoe/McGraw-Hill School Pub Co
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Chapter 3.4, Problem 3CYU
To determine

To calculate: The coordinates of the vertices of the feasible region formed by graphing the given inequalities y≥−3x+2, 9x+3y≤24 and y≥−4 . Also maximum and minimum values of the function f(x,y)=2x+14y in this region.

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Answer to Problem 3CYU

The graph of the given system of inequalities is,

  Algebra 2, Chapter 3.4, Problem 3CYU , additional homework tip 1

The coordinates of the feasible region are A(2,−4) and B(4,−4).

The maximum value of the function is either unknown or does not exist and minimum value of the function is −52 at (2,−4).

Explanation of Solution

Given information:

The inequalities y≥−3x+2, 9x+3y≤24 and y≥−4 and the function f(x,y)=2x+14y.

Formula used:

Linear programming is a technique to find the maximum and the minimum value of a given function over a given system of some inequalities, with each inequality representing a constraint. Graph the inequalities and obtain the vertices of the feasible region (solution set). Substitute the coordinates of the feasible region in the function and determine the maximum and the minimum value.

Calculation:

Consider the provided system of inequalities y≥−3x+2, 9x+3y≤24 and y≥−4.

Recall that linear programming is a technique to find the maximum and the minimum value of a given function over a given system of some inequalities, with each inequality representing a constraint. Graph the inequalities and obtain the vertices of the feasible region (solution set).

Graph the given inequalities and locate the vertices of the feasible region.

  Algebra 2, Chapter 3.4, Problem 3CYU , additional homework tip 2

Since, it is an unbounded region, the vertices of the region cannot be accurately determined. There can be infinite many points in this unbounded region, so, take the corner points where the system of inequalities cut each other, A(2,−4) and B(4,−4).

Now, to find the maximum and minimum value of the function, substitute the coordinates of the feasible region in the function and determine the maximum and the minimum value.

So, substitute A(2,−4) and B(4,−4) in the function f(x,y)=2x+14y and evaluate the maximum and minimum value as,

  (x,y)2x+14yf(x,y)(2,−4)2(2)+14(−4)−52(4,−4)2(4)+14(−4)−48

From the above table, it is observed that the minimum value of the function is −52 at (2,−4) because there are no more points below which can give minimum value of the function.

The maximum value of function is unknown or does not exist because there are infinite many points in the unbounded region which can give different maximum values at different points. So, the maximum value of function is either unknown or does not exist.

Thus, graph of the given system of inequalities is,

  Algebra 2, Chapter 3.4, Problem 3CYU , additional homework tip 3

The coordinates of the feasible region are A(2,−4) and B(4,−4) and the maximum value of the function is either unknown or does not exist and minimum value of the function is −52 at (2,−4) .

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Chapter 3.4, Problem 2CYU
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Chapter 3.4, Problem 4CYU

Chapter 3 Solutions

Algebra 2

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