The answer to this matrix equation,
[2x 3y -z]=[2y -z 15], is x=5, y=5, and z=-15 right?
Your equation in non-matrix form means
2x = 2y
3y = -z
z = -15
So I agree.
[2x 3y -z]=[2y -z 15], is x=5, y=5, and z=-15 right?
2x = 2y
3y = -z
z = -15
So I agree.