Question

resolva e classifique o sistema x+y+z= 2 / y+z= -1/ -2z= 8

Answer 1

x + y + z = 2
y + z = -1
-2z = 8

-2z = 8
-z =
$\frac{8}{2}$
-z = 4 ( -1)
z = -4

y + z = -1
y -4 = -1
y = -1 + 4
y = 3

x + y + z = 2
x + 3 - 4 = 2
x - 1 = 2
x = 2 + 1
x = 3