x + 3y - z = 13
2x -5z = 23
4x - y -2z = 14
I have no idea how to start this. please help me! thanks.
Solution:
Given x + 3y - z = 13....(1)
2x -5z = 23...(2)
4x - y -2z = 14 ..(3)
multiply (1) by 4
4x+12y-4z=52
and subtract (1) with (3)
13y-2z=38
again multiply (3 )by 3
we get 12x-3y-6z=42
subtract it by (1)
we get (13x-7z=55)*5
again (2x -5z = 23)*7
solving this we get x=38/17
y=40/17
z=-63/17