Question

X+y+z=12
2x-3z=-16
X-y-3z=-16

Answer 1

Resposta:

x = 10, y = -10, z = 12

Explicação:

x+y+z = 12

2x-3z = -16

x-y-3z = -16

((2x)-3z = -16)

((x-y)-3y = -16)

2x = x-y

2x-x = -y

x = -y

x+y+z = 12

-y+y+z = 12

z = 12

2x-3z = -16

2x-3×12 = -16

2x-36 = -16

2x = -16+36

2x = 20

x = 20÷2

x = 10

x = -y

10 = -y ×(-1)

-10 = y