I am in a matrices and power function class,
we are asked to determine if this homogeneous system has a unique solution without explicitly solving it.
-x + 2y - z = 0
2x + y + z = 0
x - y + 2z = 0
So, I setup the matrix and checked that the determinant does not equal 0. It does not, it is - 4. Then the question wants me to give the values for x,y and z without solving for them based on what I already know.
The values, it says, are x = y = z = 0
Can someone please tell me how I am to know this????