3x+y+z=1
6x+3y-2z=23
-x-5y-4z=-9
Eliminate x from the 2nd equation by
multiplying the 1st equation by -2 and
then adding it to the 2nd equation:
Eliminate x from the 3rd equation by
multiplying the 3rd equation by 3 and
then adding the 1st equation to it:
Eliminate y from the 3rd equation by
multiplying the 2nd equation by 14 and
then adding it to the 3rd equation:
Solve the 3rd equation for z
Substitute z=-4 into the 2nd equation
Substitute y=5 and z=-4 in the 1st equation
Solution: (x,y,z) = (0,5,-4)
Edwin
