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In Exercises \(1-4,\) determine if the given ordered triple is a solution of the system. In Exercises \(1-4,\) determine if the given ordered triple is a solution of the system. $$ \begin{aligned} &(2,-1,3)\\\ &\left\\{\begin{array}{c} x+y+z=4 \\ x-2 y-z=1 \\ 2 x-y-2 z=-1 \end{array}\right. \end{aligned} $$

Short Answer

Expert verified
Yes, the given ordered triple (2,-1,3) is a solution to the system of equations.

Step by step solution

01

Substitution

Start by substituting x with 2, y with -1, and z with 3 in all three equations. This gives: 2 + -1 + 3 = 4, 2 - 2*(-1) - 3 = 1, 2 * 2 -(-1) - 2 * 3 = -1. Simplify these equations to verify if the left side equals the right side.
02

Solve the First Equation

To solve first equation, simply perform the operation on the left side: 2 - 1 + 3 = 4. Hence, we confirm the first equation is correct as both sides are equal.
03

Solve the Second Equation

Performing the operation for the second equation, we get 2 + 2 - 3 = 1. Hence, the second equation also holds true, as both sides are equal.
04

Solve the Third Equation

Now for the third equation, carrying out the operations on left side produces: 4 + 1 - (2*3) = -1. Hence, the third equation is also correct as both sides are same.

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Key Concepts

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

System of Equations
Solving a system of equations is like completing a puzzle with pieces that fit together only under certain conditions. In the context of algebra, these pieces are equations with multiple variables. The goal is to find values for the variables that make all the equations simultaneously true.

A system can consist of two or more equations involving the same set of variables. In our particular scenario, the system includes three linear equations with three variables, typically represented as \(x, y, z\). An ordered triple is a set of three numbers that proposes a solution to the system by assigning specific values to those variables, essentially claiming that at those values, all the equations in the system will be satisfied.

The process of determining whether an ordered triple is a solution involves substitution and verification – plugging the proposed values into each equation and checking if the resulting statements are true.
Algebraic Substitution
Algebraic substitution is our method for replacing variables with actual numbers to assess if an equation holds true. Imagine each variable as a placeholder for a numerical value; algebraic substitution fills in these placeholders with specific numbers to create a statement that can be evaluated as true or false.

In the provided example, the ordered triple \(2, -1, 3\) suggests that for the equations to be correct, \(x\) should be substituted with 2, \(y\) with -1, and \(z\) with 3. Once we replace the variables with these values, we are left with pure numerical expressions that we can simplify to see if each equation is satisfied.
Solution Verification
Solution verification is the detective work of algebra; it's how we confirm if the suspect (the ordered triple) is indeed the perpetrator of balancing the equation. After substituting the variables with their respective values, it's time to simplify the equations and compare both sides of the equation.

If, after simplification, the left side of an equation is equal to the right side, we've confirmed that the equation holds true for the given set of values. For all equations in the system to be true, this condition must be met by each one without exception. If even one equation doesn't balance out, the ordered triple is not a solution to the system.
Solving Linear Equations
Linear equations are the most straightforward type in algebra, representing straight lines on a graph. In a linear equation, each term is either a constant or the product of a constant and a single variable. Solving them typically means finding the value(s) of the variable(s) that make the equation true.

Within a system of linear equations, solving them often requires methods such as substitution, elimination, or graphing. The ordered triple solution aligns with the point of intersection of these lines in a three-dimensional space. In the context of the provided exercise, verification of each linear equation was crucial to establish that the proposed ordered triple \(2, -1, 3\) accurately solved the system.

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Most popular questions from this chapter

Many elevators have a capacity of 2000 pounds. a. If a child averages 50 pounds and an adult 150 pounds, write an inequality that describes when \(x\) children and \(y\) adults will cause the elevator to be overloaded. b. Graph the inequality. Because \(x\) and \(y\) must be positive, limit the graph to quadrant I only. c. Select an ordered pair satisfying the inequality. What are its coordinates and what do they represent in this situation?

On your next vacation, you will divide lodging between large resorts and small inns. Let \(x\) represent the number of nights spent in large resorts. Let \(y\) represent the number of nights spent in small inns. a. Write a system of inequalities that models the following conditions: You want to stay at least 5 nights. At least one night should be spent at a large resort. Large resorts average \(\$ 200\) per night and small inns average \(\$ 100\) per night. Your budget permits no more than \(\$ 700\) for lodging. b. Graph the solution set of the system of inequalities in part (a). c. Based on your graph in part (b), what is the greatest number of nights you could spend at a large resort and still stay within your budget?

Solve each system by the method of your choice. $$\left\\{\begin{array}{l} 2 x^{2}+y^{2}-18 \\ x y-4 \end{array}\right.$$

The graphs of solution sets of systems of inequalities involve finding the intersection of the solution sets of two or more inequalities. By contrast, in Exercises \(71-72,\) you will be graphing the union of the solution sets of two inequalities. Graph the union of \(y>\frac{3}{2} x-2\) and \(y<4\).

Use a system of linear equations to solve. When an airplane flies with the wind, it travels 800 miles in 4 hours. Against the wind, it takes 5 hours to cover the same distance. Find the plane's rate in still air and the rate of the wind.

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