Modeling with Two-Variable Linear Inequalities Quiz

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Questions and Answers

What are linear inequalities?

Mathematical expressions involving only linear functions

Mathematical expressions involving linear functions and the equality symbol

Mathematical expressions involving only quadratic functions

Mathematical expressions involving linear functions and the inequality symbol (correct)

Why are word problems involving linear inequalities important?

They are only important in academic settings

They help understand the theoretical concepts better

They are essential for understanding the real-world applications of these mathematical concepts (correct)

They are not important for real-world applications

In the given word problem, how much should Maria earn to cover her expenses?

$50

$100 (correct)

$10

$200

What do linear inequalities help determine in budgeting?

The amount of money available for various expenses Signup and view all the answers

Which field benefits from the applications of linear inequalities?

Budgeting Signup and view all the answers

What is essential for solving word problems involving linear inequalities?

Solving techniques using only algebra Signup and view all the answers

When solving the inequality $3x - 5 > 10$, what is the correct solution set?

$x > 5$ Signup and view all the answers

For the inequality $2x + 1 < 4$, what is the interval that satisfies the inequality?

$(-\rac{1}{2}, 4)$ Signup and view all the answers

What is the feasible region for a system of linear inequalities that must be solved simultaneously?

The region where all inequalities are satisfied Signup and view all the answers

If the solution set for a system of linear inequalities is a line, what does it imply about the solution?

The solution is infinite Signup and view all the answers

In solving the inequality $x - 2 < 7$, what is the correct solution set?

$x < 7$ Signup and view all the answers

When graphing the inequality $4x + 3 > 11$, what would be the correct interval that satisfies the inequality?

$(2, \rac{8}{3})$ Signup and view all the answers

For the inequality $5x - 9 \ imes 2 > 7$, what is the correct solution set?

$x > \rac{23}{10}$ Signup and view all the answers

When solving the inequality $6x + 4 \ imes 3 < 25$, what is the correct solution set?

$x > \rac{7}{6}$ Signup and view all the answers

What is the interval that satisfies the inequality $-2x - 3 < -5$?

$(-1, -\rac{1}{2})$ Signup and view all the answers

When graphing the inequality $-3x + 7 > -8$, what would be the correct interval that satisfies the inequality?

$(5, \rac{9}{4})$ Signup and view all the answers

Study Notes

Maths: Linear Inequalities

Linear inequalities are mathematical expressions that involve linear functions and the inequality symbol, typically represented by the less than or greater than signs. They cover various aspects of our daily lives and are essential in various applications, from budgeting to maximizing profits and minimizing costs. In this article, we will discuss the basics of linear inequalities, word problems, applications, solving techniques, graphing, and systems of linear inequalities.

Word Problems Involving Linear Inequalities

Word problems involving linear inequalities are essential for understanding the real-world applications of these mathematical concepts. For example, consider the following problem:

Maria earns $10 for every hour she works, and she has to work at least 10 hours to cover her expenses. If she wants to earn more than $100, how many hours should she work?

To solve this problem, we need to set up an inequality that represents the given information, solve it, and find the solution(s) that satisfy the problem's conditions.

Applications of Linear Inequalities

Linear inequalities have numerous applications in various fields, such as:

Budgeting: They help determine the amount of money available for various expenses, ensuring that total expenses do not exceed the budget.
Business: Linear inequalities are used to maximize profits and minimize costs by identifying the optimal production levels and resource allocation.
Economics: They help analyze supply and demand, price elasticity, and market equilibrium.
Physics: Linear inequalities are used to calculate the speed, velocity, and acceleration of objects under various conditions.

Solving Linear Inequalities

Solving linear inequalities involves the following steps:

Identify the variable and the inequality symbol.
Solve the inequality for the variable by isolating it on one side.
Check the solution by substituting a test value into the original inequality.
Graph the solution set.
Identify the interval(s) that satisfy the inequality.

For example, consider the inequality:

$$3x - 5 > 10$$

Solving this inequality involves the following steps:

Identify the variable: $$x$$
Solve the inequality for the variable:
- Add 5 to both sides: $$3x > 15$$
- Divide both sides by 3: $$x > 5$$
Check the solution: Substitute a test value, such as $$x = 6$$: $$3(6) - 5 = 18 - 5 = 13 > 15$$
Graph the solution set:
Identify the interval(s) that satisfy the inequality: The solution is any number greater than 5, so the interval is $$(5, \infty)$$.

Graphing Linear Inequalities

Graphing linear inequalities involves plotting the solution set on a graph, which represents the inequality's conditions. For example, consider the inequality:

$$2x + 1 < 4$$

To graph this inequality, follow these steps:

Identify the variable: $$x$$
Solve the inequality for the variable:
- Subtract 1 from both sides: $$2x < 3$$
Graph the solution set:
- Shade the region that represents the inequality's conditions.
Identify the interval(s) that satisfy the inequality: The solution is any number less than 3, so the interval is $$(-\infty, 3)$$.

Systems of Linear Inequalities

A system of linear inequalities is a set of linear inequalities that must be solved simultaneously. To solve a system of linear inequalities, follow these steps:

Graph each inequality on the same coordinate plane.
Identify the feasible region, which is the region where all inequalities are satisfied.
Check the solution set for each inequality:
- If the solution set is a single point, the solution is unique.
- If the solution set is a line, the solution is infinite.
If the feasible region is empty, the system has no solution.

For example, consider the system of linear inequalities:

$$ \begin{cases} 2x + 1 > 3 \ x - 2 < 1 \end{cases} $$

To solve this system, graph both inequalities on the same coordinate plane and identify the feasible region, which is the intersection of the two inequalities. In this case, the feasible region is empty, so the system has no solution.

In conclusion, linear inequalities are essential in various applications, from budgeting to physics and economics. By understanding the basics of linear inequalities, solving techniques, graphing, and systems of linear inequalities, we can effectively analyze and solve real-world problems involving these mathematical concepts.

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Description

Test your knowledge of linear inequalities with this quiz covering word problems, applications, solving techniques, graphing, and systems of linear inequalities. Explore real-world scenarios involving linear inequalities and enhance your understanding of their significance in various fields.