Example: Solving a System of Three Equations Using Cramer's Rule
Solve the system of equations using Cramer's rule: \left\{\begin{array}{l} 3x - 5y + 4z = 5 \\ 5x + 2y + z = 0 \\ 2x + 3y - 2z = 3 \end{array} ight.. First, evaluate the main determinant using the coefficients of the variables. By expanding by minors, we find . Next, evaluate by using the constants to replace the coefficients of ; expanding by minors yields . Then, evaluate by replacing the coefficients of with the constants, yielding . Finally, evaluate by replacing the coefficients of with the constants, which yields . Find the values of , , and by substituting into the formulas: , , and . Write the solution as the ordered triple and check that it is a solution to all three original equations.
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Ch.4 Systems of Linear Equations - Intermediate Algebra @ OpenStax
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