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A ____________________ of a system of inequalities in \(x\) and \(y\) is a point \((x, y)\) that satisties each inequality in the system.

Short Answer

Expert verified
A solution of a system of inequalities in \(x\) and \(y\) is any point \((x, y)\) that satisfies each inequality in the system. It means that if we substitute \(x\) and \(y\) values of the point into each inequality, each of these inequalities will hold true.

Step by step solution

01

Understand the context

The term 'solution' is being used in the context of a system of inequalities. This involves a number of inequalities that are all being considered at the same time. A solution to such a system would consist of all the points that satisfy all inequalities.
02

Define the term

A solution of a system of inequalities in \(x\) and \(y\) is any point \((x, y)\) that satisfies each inequality in the system. This means for every inequality in the system, if we substitute the \(x\) and \(y\) values of the point into it, the inequality will hold true.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Solution to a System of Inequalities
A solution to a system of inequalities is found by identifying all the points that satisfy every inequality within the system. Think of this as finding the overlap of shaded regions on a graph. Each inequality describes a region in the coordinate plane, and the solution to the system is where these regions intersect.

To determine if a point is a solution, substitute the coordinates of the point into each inequality. If the result holds true for all inequalities, then the point is indeed a solution. Conversely, if any of the inequalities aren't satisfied, then the point is not part of the solution set.

Finding all such points involves graphing each inequality and then determining the common area, if it exists. This process is crucial in many applications, from optimization problems to real-world scenarios where multiple constraints must be satisfied simultaneously.
Understanding Inequalities
Inequalities are mathematical expressions that describe the relative size or order of two values. Unlike equations, which state that two expressions are equal, inequalities express a range of possible solutions.

Common symbols used include:
  • \( > \) greater than
  • \( < \) less than
  • \( \geq \) greater than or equal to
  • \( \leq \) less than or equal to
In relation to systems of inequalities, each inequality defines a half-plane on a graph. For instance, if we have the inequality \( y > x \), the solution consists of all points above the line \( y = x \).

When working with multiple inequalities, it's essential to shade the correct region for each one. The solution to the system is where all these shaded regions overlap. Accurately graphing these inequalities helps us visualize and better understand the solution set.
Role of Coordinate Geometry
Coordinate geometry, or analytic geometry, plays a critical role in solving systems of inequalities. It provides a way to visually interpret algebraic inequalities by plotting them in a coordinate plane.

Each inequality represents a line (or curve, depending on the equation) that divides the plane into two halves. These lines help us see where multiple inequalities might intersect. The solution to the system is the common area shared by the individual solutions of the inequalities.

This visual approach helps in understanding how different mathematical conditions relate to one another. With this method, you can easily see adjustments needed in constraints and how they impact the overall solution area, making it a powerful tool for both academic study and real-world problem-solving.

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Most popular questions from this chapter

Graphical Reasoning Two concentric circles have radii \(x\) and \(y,\) where \(y>x .\) The area between the circles is at least 10 square units. (a) Find a system of inequalities describing the constraints on the circles. (b) Use a graphing utility to graph the system of inequalities in part (a). Graph the line \(y=x\) in the same viewing window. (c) Identify the graph of the line in relation to the boundary of the inequality. Explain its meaning in the context of the problem.

Advanced Applications In Exercises 73 and \(74 ,\) find values of \(x , y ,\) and \(\lambda\) that satisfy the system. These systems arise in certain optimization problems in calculus, and \(\lambda\) is called a Lagrange multiplier. $$ \left\\{ \begin{aligned} 2 + 2 y + 2 \lambda & = 0 \\ 2 x + 1 + \lambda & = 0 \\\ 2 x + y - 100 & = 0 \end{aligned} \right. $$

Defense Department Outlays The table shows the total national outlays \(y\) for defense functions \((\) in billions of dollars) for the years 2004 through 2011 . (Source: \(U . S .\) Office of Management and Budget) (a) Find the least squares regression line \(y=a t+b\) for the data, where \(t\) represents the year with \(t=4\) corresponding to \(2004,\) by solving the system for \(a\) and \(b .\) $$ \left\\{\begin{aligned} 8 b+60 a &=4700.5 \\ 60 b+492 a &=36,865.0 \end{aligned}\right. $$ (b) Use the regression feature of a graphing utility to confirm the result of part (a). (c) Use the linear model to create a table of estimated values of \(y .\) Compare the estimated values with the actual data. (d) Use the linear model to estimate the total national outlay for \(2012 .\) (e) Use the Internet, your school's library, or some other reference source to find the total national outlay for \(2012 .\) How does this value compare with your answer in part (d)? (f) Is the linear model valid for long-term predictions of total national outlays? Explain.

Solving a Linear Programming Problem, find the minimum and maximum values of the objective function and where they occur, subject to the indicated constraints. (For each exercise, the graph of the region determined by the constraints is provided.) $$ \begin{array}{c}{\text { Objective function: }} \\ {z=4 x+5 y} \\ {\text { Constraints: }} \\ {x \geq 0} \\ {2 x+3 y \geq 6} \\ {3 x+y \leq 9} \\\ {x+4 y \leq 16}\end{array} $$

Think About It In Exercises 67 and \(68,\) the graphs of the two equations appear to be parallel. Yet, when you solve the system algebraically, you find that the system does have a solution. Find the solution and explain why it does not appear on the portion of the graph shown. $$ \left\\{\begin{array}{rr}{100 y-x=} & {200} \\ {99 y-x=} & {-198}\end{array}\right. $$

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