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Chapter 1: Problem 114

What is an inconsistent equation? Give an example.

Short Answer

Expert verified
An inconsistent equation is an equation that has no solution. For example, the system of equations \[y = 2x + 3\] and \[y = 2x + 5\] is inconsistent, because these are parallel lines that never intersect, meaning that there is no solution to this system.

Step by step solution

01

Definition

An inconsistent equation is a type of equation that has no solution. It occurs when the left and right sides of the equation never meet or intersect, thus, there is no point that can satisfy both sides of the equation simultaneously.
02

Example

An example of an inconsistent equation could be coming from a system of linear equations. For instance, consider the following two equations: \[y = 2x + 3\] and \[y = 2x + 5\]. These equations have the same slopes but different y-intercepts, meaning that they are parallel lines that will never intersect, so there is no solution to this system.
03

Verification

As an extra step, you may prove that the two equations are indeed inconsistent. You can do that by attempting to solve the system using any valid method (like substitution or elimination). For the given example, if you subtract the second equation from the first, you will get \[0 = 2\], which is a contradiction; confirming that the system of equations is inconsistent.

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Key Concepts

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

Understanding System of Equations
A system of equations is a collection of two or more equations that work together to define a relationship among a set of variables. The primary goal of solving a system of equations is to find the set of values that satisfies all equations in the system simultaneously. Typically, systems of equations can be solved using various methods, such as:
  • Substitution: Solving one equation for a variable and then substituting this expression into the other equations.
  • Elimination: Adding or subtracting equations to eliminate a variable, thereby simplifying the system.
  • Graphical Method: Plotting each equation on a graph to find intersections that represent the solutions.
In real-world applications, systems of equations arise in numerous contexts, from computing costs in budgeting problems to analyzing traffic flow. Understanding how they work and verifying potential solutions is crucial, especially when dealing with inconsistent equations.
Exploring Linear Equations
Linear equations are the simplest forms of algebraic equations, where each term is either a constant or the product of a constant and a single variable. These equations have the general form:\[ ax + b = 0 \]where \(a\) and \(b\) are constants, with \(x\) as the variable. Linear equations graph as straight lines on a coordinate plane.

Key features of linear equations include:
  • Slope: This describes the rate at which \(y\) changes with respect to \(x\). For example, in the equation \(y = 2x + 3\), the slope is 2.
  • Y-intercept: The point where the line crosses the y-axis. In \(y = 2x + 3\), the y-intercept is 3.
  • Consistency: Two linear equations can be consistent (intersecting at a point) or inconsistent (parallel with no intersection).
Linear equations are foundational in solving more complex mathematical problems and modeling real-world scenarios.
The Role of Parallel Lines in Inconsistent Equations
Parallel lines are lines in a plane that never intersect. They have the same slope but different y-intercepts. In the context of systems of equations, if the equations have the same slope and different y-intercepts, the lines they represent are parallel, resulting in no point of intersection. This indicates an inconsistent system.

When dealing with inconsistent equations:
  • The graph of the system will show two parallel lines that never meet.
  • If attempting to solve algebraically, any manipulation, like subtraction or addition, will lead to a contradictory statement (e.g., \(0 = 2\)).
  • This contradiction highlights the absence of a possible solution, as no single value can satisfy both equations simultaneously.
Understanding the concept of parallel lines is crucial in recognizing and interpreting inconsistent systems of equations, allowing students to better grasp situations where systems lack solutions.

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Most popular questions from this chapter

Solve absolute value inequality. \(2>|1-x|\)

A bank offers two checking account plans. Plan A has a base service charge of \(\$ 4.00\) per month plus 10 莽 per check. Plan \(\mathrm{B}\) charges a base service charge of \(\$ 2.00\) per month plus \(15 \phi\) per check. a. Write models for the total monthly costs for each plan if \(x\) checks are written. b. Use a graphing utility to graph the models in the same \([0,50,10]\) by \([0,10,1]\) viewing rectangle. c. Use the graphs (and the intersection feature) to determine for what number of checks per month plan A. will be better than plan B. d. Verify the result of part (c) algebraically by solving an inequality.

Use the strategy for solving word problems, modeling the verbal conditions of the problem with a linear inequality. On two examinations, you have grades of 86 and 88 . There is an optional final examination, which counts as one grade. You decide to take the final in order to get a course grade of A, meaning a final average of at least 90 . a. What must you get on the final to earn an A in the course? b. By taking the final, if you do poorly, you might risk the B that you have in the course based on the first two exam grades. If your final average is less than \(80,\) you will lose your \(\mathrm{B}\) in the course. Describe the grades on the final that will cause this to happen.

Determine whether statement makes sense or does not make sense, and explain your reasoning. I can check inequalities by substituting 0 for the variable: When 0 belongs to the solution set. I should obtain a true statement, and when 0 does not belong to the solution set, I should obtain a false statement.

Each group member should research one situation that provides two different pricing options. These can involve areas such as public transportation options (with or without discount passes), cellphone plans, long-distance telephone plans, or anything of interest. Be sure to bring in all the details for each option. At a second group meeting, select the two pricing situations that are most interesting and relevant. Using each situation, write a word problem about selecting the better of the two options. The word problem should be one that can be solved using a linear inequality. The group should turn in the two problems and their solutions.
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