spltv x+y+z=-2 x+y=0 x-3z7 adalah?

x+y+z = -2. x+y = 0, x-3z = 7
(x+y) +z = -2
0 + z = -2
z = -2
x-3z = 7
x-3(-2) = 7
x +6 = 7
x = 7-6 = 1
x+y = 0
1 + y = 0
y = 0-1 = -1
HP = { ( 1, -1, -2) }