Solve the following equations by the invers method :
` x + y + z = - 1, x - y + z = 2, x + y - z = 3`.

Solve the following equations by inverse method : x + z = -1 , y +z = - 4, 4x + y + z = 0 .

Solve the following equations by reduction method : x - y + z = 4, 2x + y - 3z = 0 , x + y + z = 2

Solve the following equations by using reduction method : 2x - y + z = 1, x + 2y + 3z = 8, 3x + y - 4z = 1 .

Solve the following equations by matrix method. 2x + y + z = 1, x - 2y - 3z=1 and 3x + 2y +4z=5

Solve the following equations (by matrix method) : 2x +y + z= 7, x - y - z=-4, 3x +2y+z= 10

Solve the following equations by the method of inversion: x+y+z = -1 , x-y+z = 2 and x+y-z = 3 .