Question

3x-4y+2z=-1 , 2x+3y+5z=7 , X+Z=2 , then x=

Answer 1

I think u can use elimination or substitution method

Answer 2

x+z=2
=>x=z-2............(1)
3x-4y+2z=-1
from 1
F
3(z-2)-4y+2z=-1
3z-6-4y+2z=-1
3z-4y+2z=-1+6
5z-4y=5
z=5-4y/5...........................(2)
2x+3y+5z=7
from 1&2
2(z-2)+3y+5(5-4y/5)=7
2z-4+3y+5-4y=7
from ............(2)
2(5-4y/5)-3y+5-4y=7
10-8y/5-3y+5-4y=7
10-8y-15y+25-20y=35
-28y=0
y=0
from2
z=5-4(0)/5
z=1
from 1
x=1-2=-1