SOLVE THE EQUATION(MATHS)

Using equation (4) - (3), we have
5z =-1, z = -0.2
Equations become
x - 2y + 3(-0.2) = 2 => x - 2y = 2.6 ...(5)
2x + 3y - 2(-0.2) = 5 => 2x + 3y = 4.6 ...(6)
4x -y - (-0.2) = 2 => 4x-y=1.8' ...(7)
(6) - 2 x (5) gives 7y = 4.6 - 5.2 = -0.6 => y = -6/70.
(7) - 4 x (5) gives 7y = 1.8 - 10.4 = -8.6 => y = -86/70.
It is a contradiction, there is no feasible solution.