교과서 질문
In Exercises 14–27, perform the indicated matrix operations given that and D are defined as follows. If an operation is not defined, state the reason. -5(A+D)
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Ch. 6 - Matrices and Determinants
Blitzer8th EditionCollege AlgebraISBN: 9780136970514
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TOC.tableOfContents
- Ch. P - Fundamental Concepts of Algebra311
- Ch. 1 - Equations and Inequalities398
- Ch. 2 - Functions and Graphs407
- Ch. 3 - Polynomial and Rational Functions306
- Ch. 4 - Exponential and Logarithmic Functions247
- Ch. 5 - Systems of Equations and Inequalities173
- Ch. 6 - Matrices and Determinants143
- Ch. 7 - Conic Sections124
- Ch. 8 - Sequences, Induction, and Probability251
7장, 문제 19
In Exercises 1 - 24, use Gaussian Elimination to find the complete solution to each system of equations, or show that none exists.
검증된 단계별 안내1
Write the system of equations as an augmented matrix:
\[\left[\begin{array}{ccc|c} 1 & 1 & -2 & 2 \\ 3 & -1 & -6 & -7 \end{array}\right]\]
Use the first row to eliminate the \(x\)-term in the second row. Multiply the first row by 3 and subtract it from the second row:
\[R_2 \rightarrow R_2 - 3R_1\]
Perform the row operation to get the new second row:
\[\left[\begin{array}{ccc|c} 1 & 1 & -2 & 2 \\ 0 & -4 & 0 & -13 \end{array}\right]\]
Solve the second equation for \(y\) by dividing the entire second row by the coefficient of \(y\):
\[y = \frac{-13}{-4} = \frac{13}{4}\]
Substitute the value of \(y\) back into the first equation to solve for \(x\) in terms of \(z\):
\[x + \frac{13}{4} - 2z = 2\]
Then isolate \(x\) to express it as
\[x = 2 - \frac{13}{4} + 2z\]
비슷한 문제에 대한 검증된 영상 답변:
이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
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주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Systems of Linear Equations
A system of linear equations consists of two or more linear equations involving the same set of variables. The goal is to find values for the variables that satisfy all equations simultaneously. Understanding how to represent and interpret these systems is fundamental before applying solution methods.
추천 영상:
4:27
Introduction to Systems of Linear Equations
Gaussian Elimination
Gaussian elimination is a systematic method for solving systems of linear equations by transforming the system's augmented matrix into row-echelon form using row operations. This process simplifies the system, making it easier to solve by back-substitution or to determine if no solution exists.
추천 영상:
6:48Solving Systems of Equations - Elimination
Row Operations and Consistency of Systems
Row operations include swapping rows, multiplying a row by a nonzero scalar, and adding multiples of one row to another. These operations preserve the solution set and help identify if the system is consistent (has at least one solution) or inconsistent (no solution). Recognizing inconsistent rows is key to concluding no solution exists.
추천 영상:
8:38Performing Row Operations on Matrices
관련 실천
교과서 질문
In Exercises 1 - 24, use Gaussian Elimination to find the complete solution to each system of equations, or show that none exists.
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교과서 질문
In Exercises 14–27, perform the indicated matrix operations given that and D are defined as follows. If an operation is not defined, state the reason. 3A+2D
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교과서 질문
Let and . Solve each matrix equation for X. 2X + A = B
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교과서 질문
In Exercises 19–20, a few steps in the process of simplifying the given matrix to row-echelon form, with 1s down the diagonal from upper left to lower right, and 0s below the 1s, are shown. Fill in the missing numbers in the steps that are shown.
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교과서 질문
For Exercises 11–22, use Cramer's Rule to solve each system.
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