Finite Math Examples

Solve Using a Matrix with Cramer's Rule x+3y-13*-2=18 , y-5*-2=3
,
Step 1
Move all of the variables to the left side of each equation.
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Step 1.1
Multiply by .
Step 1.2
Move all terms not containing a variable to the right side of the equation.
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Step 1.2.1
Subtract from both sides of the equation.
Step 1.2.2
Subtract from .
Step 1.3
Multiply by .
Step 1.4
Move all terms not containing a variable to the right side of the equation.
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Step 1.4.1
Subtract from both sides of the equation.
Step 1.4.2
Subtract from .
Step 2
Represent the system of equations in matrix format.
Step 3
Find the determinant of the coefficient matrix .
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Step 3.1
Write in determinant notation.
Step 3.2
The determinant of a matrix can be found using the formula .
Step 3.3
Simplify the determinant.
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Step 3.3.1
Simplify each term.
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Step 3.3.1.1
Multiply by .
Step 3.3.1.2
Multiply by .
Step 3.3.2
Add and .
Step 4
Since the determinant is not , the system can be solved using Cramer's Rule.
Step 5
Find the value of by Cramer's Rule, which states that .
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Step 5.1
Replace column of the coefficient matrix that corresponds to the -coefficients of the system with .
Step 5.2
Find the determinant.
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Step 5.2.1
The determinant of a matrix can be found using the formula .
Step 5.2.2
Simplify the determinant.
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Step 5.2.2.1
Simplify each term.
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Step 5.2.2.1.1
Multiply by .
Step 5.2.2.1.2
Multiply .
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Step 5.2.2.1.2.1
Multiply by .
Step 5.2.2.1.2.2
Multiply by .
Step 5.2.2.2
Add and .
Step 5.3
Use the formula to solve for .
Step 5.4
Substitute for and for in the formula.
Step 5.5
Divide by .
Step 6
Find the value of by Cramer's Rule, which states that .
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Step 6.1
Replace column of the coefficient matrix that corresponds to the -coefficients of the system with .
Step 6.2
Find the determinant.
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Step 6.2.1
The determinant of a matrix can be found using the formula .
Step 6.2.2
Simplify the determinant.
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Step 6.2.2.1
Simplify each term.
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Step 6.2.2.1.1
Multiply by .
Step 6.2.2.1.2
Multiply by .
Step 6.2.2.2
Add and .
Step 6.3
Use the formula to solve for .
Step 6.4
Substitute for and for in the formula.
Step 6.5
Divide by .
Step 7
List the solution to the system of equations.