Now compute the x-value of the solution, which is the determinant of matrix B divided by the determinant of matrix A. We previously found the determinant of matrix A (the coefficient matrix), which is 25.
The x-coordinate of the solution is -1. To find y, make a new copy of matrix A into matrix B, then replace the second column of entries (coefficients of y) with the constant terms.
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[MATH] 
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