| Solved by pluggable solver: Using Cramer's Rule to Solve Systems with 2 variables |
First let Take note that the right hand values of the system are These values are important as they will be used to replace the columns of the matrix A. Now let's calculate the the determinant of the matrix A to get Notation note: --------------------------------------------------------- Now replace the first column of A (that corresponds to the variable 'x') with the values that form the right hand side of the system of equations. We will denote this new matrix Now compute the determinant of To find the first solution, simply divide the determinant of So the first solution is --------------------------------------------------------- We'll follow the same basic idea to find the other solution. Let's reset by letting Now replace the second column of A (that corresponds to the variable 'y') with the values that form the right hand side of the system of equations. We will denote this new matrix Now compute the determinant of To find the second solution, divide the determinant of So the second solution is ==================================================================================== Final Answer: So the solutions are Once again, Cramer's Rule is dependent on determinants. Take a look at this 2x2 Determinant Solver if you need more practice with determinants. |