Question

how do cramer's rule get the answer. from the equation.
2x + y + z = 3
x – y – z = 0
x + 2y + z = 0

Answer 1

posting a solution in a sec, basically you get the determinant of the matrix formed by this system, then you get the determinants of the matrices formed when you replace each column with the solution you want (3,0,0). and you divide them.

Answer 2

According to Cramer's Rule, \[x=\frac{D_{x}}{D} y=\frac{D_{y}}{D} z=\frac{D_{z}}{D} \]