In Exercises 65–68, write the given sentences as a system of inequalities in two variables. Then graph the system. The sum of the x-variable and the y-variable is no more than 2. The y-variabe is no less than the difference between the square of the x-variable and 4.
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
7. Systems of Equations & Matrices
Graphing Systems of Inequalities
Problem 56
Textbook Question
Find the value of the objective function z = 2x + 3y at each corner of the graphed region shown. What is the maximum value of the objective function? What is the minimum value of the objective function?

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Identify the corner points of the shaded region from the graph. The corner points are (0, 0), (0, 13), (4, 5), and (5, 0).
Substitute each corner point into the objective function z = 2x + 3y to calculate the value of z at each point. For example, for the point (0, 0), substitute x = 0 and y = 0 into the equation.
Repeat the substitution for the other corner points: (0, 13), (4, 5), and (5, 0). For each point, calculate the value of z = 2x + 3y.
Compare the calculated values of z for all the corner points. The maximum value of z corresponds to the maximum value of the objective function, and the minimum value of z corresponds to the minimum value of the objective function.
State the corner point where the maximum value occurs and the corner point where the minimum value occurs, along with their respective z values.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Objective Function
An objective function is a mathematical expression that defines the goal of an optimization problem, typically in the form of maximizing or minimizing a value. In this case, the objective function is z = 2x + 3y, which needs to be evaluated at specific points to find its maximum and minimum values within a defined region.
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Corner Points
Corner points, or vertices, of a feasible region are the points where the boundary lines intersect. In linear programming, the maximum and minimum values of the objective function occur at these corner points. The graph shows the corner points (0,0), (0,13), (4,5), and (5,0), which are essential for evaluating the objective function.
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Feasible Region
The feasible region is the area on a graph that satisfies all constraints of a linear programming problem. It is typically bounded by the lines representing the constraints. The shaded region in the graph indicates the feasible region where the objective function will be evaluated to determine its maximum and minimum values.
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