Find the ordered triple of these equations.
x + y + z = 8
x - y = 2
z = 4
plug z into the first equation. I am going to number them for simplicity.
1). x + y + z = 8
2). x - y = 2
3). z = 4
1a). x + y + 4 = 8
1a). x + y = 4
2). x - y = 2 Add these two equations.
1a) - 2) => 2x = 6
x = 3
plug into 2). 3 - y = 4
-y = 1
y = -1
therefore: x = 3, y = -1 and z = 4
the ordered triple would be (3, -1, 4)