Question 813449
4x+8y-4z = 12,
divide by 4
x+2y -1z=3
divide by 3
3x+6y-3z = 9,
x+2y-z=3

-x-2y+ z =-3
multiply by -1
x+2y-3=3

a) no solution
z = x+2 y-3,
z = x+2 y-3,
z = x+2 y-3}