Example: Use Gaussian elimination to solve the following systems: x - y = 2 1)}2x - y - z=3 x + y + z = 6 x + y - 2z = 1 2) Y-z=3 (-x + 4y - 3z = 14 2x + y + z = 5 5) 4x - y = -2 -2x + 7y + 2z = 9 x +y +z = 6 4) 2x -y +z = 3 x+z= 4 x + y - 2z = 1 3)-x + 4y - 3z = 1 y - z= 3 (3x + y - 6z = -10 6) 2x + y - 5z = -8 6x 3y + 3z = 0