y+z=8
x+z=6
(y+z) + (x+z)=(8) + (6)
x+y+2z=14, x+y=4
4+2z=14 ; 2z=10,z=5
x+z=6, x=1
x+y=4, y=3
x-y+2z= 1-3+10=8
y+z=8
x+z=6
(y+z) + (x+z)=(8) + (6)
x+y+2z=14, x+y=4
4+2z=14 ; 2z=10,z=5
x+z=6, x=1
x+y=4, y=3
x-y+2z= 1-3+10=8