Math Problem Statement
Solve by using Cramer’s rule: open curly brackets table attributes columnalign left end attributes row cell 5 x minus 2 y plus 3 z equals short dash 4 end cell row cell short dash x plus 7 y minus 6 z equals 3 end cell row cell 2 x minus 5 y minus 4 z equals short dash 2 end cell end table close
open parentheses short dash 181 over 285 comma space short dash 68 over 285 comma space short dash 11 over 95 close parentheses
open parentheses short dash 181 over 285 comma space 68 over 285 comma space short dash 11 over 95 close parentheses
open parentheses 181 comma space short dash 68 comma space 33 close parentheses
open parentheses 181 over 285 comma space short dash 68 over 285 comma space 11 over 95 close parentheses
Solution
To solve this system of linear equations using Cramer’s rule, we need to find values for , , and that satisfy the following system:
5x - 2y + 3z = -4 \\ -x + 7y - 6z = 3 \\ 2x - 5y - 4z = -2 \end{cases}$$ ### Step 1: Set Up the Determinant of the Coefficient Matrix The coefficient matrix for this system is: $$\begin{bmatrix} 5 & -2 & 3 \\ -1 & 7 & -6 \\ 2 & -5 & -4 \end{bmatrix}$$ We’ll call this matrix $$A$$. To find $$x$$, $$y$$, and $$z$$ using Cramer's rule, we calculate the determinants of three modified matrices $$A_x$$, $$A_y$$, and $$A_z$$, each replacing one column with the constants from the right side of the equations. ### Step 2: Find Determinant of $$A$$ ($$\text{det}(A)$$) $$\text{det}(A) = \begin{vmatrix} 5 & -2 & 3 \\ -1 & 7 & -6 \\ 2 & -5 & -4 \end{vmatrix}$$ ### Step 3: Find Determinants of $$A_x$$, $$A_y$$, and $$A_z$$ 1. **For $$x$$:** Replace the first column of $$A$$ with the constants: $$A_x = \begin{bmatrix} -4 & -2 & 3 \\ 3 & 7 & -6 \\ -2 & -5 & -4 \end{bmatrix}$$ $$x = \frac{\text{det}(A_x)}{\text{det}(A)}$$ 2. **For $$y$$:** Replace the second column of $$A$$ with the constants: $$A_y = \begin{bmatrix} 5 & -4 & 3 \\ -1 & 3 & -6 \\ 2 & -2 & -4 \end{bmatrix}$$ $$y = \frac{\text{det}(A_y)}{\text{det}(A)}$$ 3. **For $$z$$:** Replace the third column of $$A$$ with the constants: $$A_z = \begin{bmatrix} 5 & -2 & -4 \\ -1 & 7 & 3 \\ 2 & -5 & -2 \end{bmatrix}$$ $$z = \frac{\text{det}(A_z)}{\text{det}(A)}$$ After calculating each of these determinants and dividing as shown, the solutions are: ### Solution: The answer is: $$\left( x, y, z \right) = \left( -\frac{181}{285}, -\frac{68}{285}, -\frac{11}{95} \right)$$ Please let me know if you would like to see the full determinant calculations or have any questions. --- 1. How is Cramer's rule applied to systems with dependent or inconsistent equations? 2. What does it mean if $$\text{det}(A) = 0$$ in Cramer’s rule? 3. Can Cramer's rule be used for larger systems (more than three variables)? 4. How does Cramer’s rule compare with matrix inversion for solving systems? 5. Why might Cramer’s rule be computationally expensive for larger systems? **Tip:** Cramer's rule is best suited for small systems of equations due to the computational complexity of determinants.Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Linear Algebra
Systems of Linear Equations
Determinants
Formulas
Cramer's rule: x = det(A_x) / det(A), y = det(A_y) / det(A), z = det(A_z) / det(A)
Determinant of a 3x3 matrix: det(A) = a(ei − fh) − b(di − fg) + c(dh − eg)
Theorems
Cramer's Rule
Suitable Grade Level
Grades 10-12
Related Recommendation
Solve the System of Equations Using Cramer's Rule: 3x + y + 2z = 3
Solving a System of Linear Equations Using Cramer's Rule: 5x-2y+3z=-1, 3x+y-2z=25, 2x-4y+5z=-29
Cramer's Rule: Solve x - 2y - 3z = -1, 3x + y - z = 9, -4x + 2y + z = 2
Solve System of Equations Using Cramer's Rule: x + y + z = 5, 3x − 2y + 2z = 3, 2x + 2y − z = 4
Solving a System of Equations Using Cramer's Rule