Question

X - y - z = -1
-x + y + y = 1
x + y - z = 1

Answer 1

hello :
X - y - z = -1 ...(1)
-x + y + z = 1 ...(2)
x + y - z = 1 ...(3)
(2) +(3) : 2y = 2 y = 1
subsct in (1) and (2) : x - z =0
-x +z = 0
so x = z the solution has form : (x , 1 , x ) .... x in R