Реши систему уравнений: -z-2y+1=5 z=-5-y

-z - 2y + 1 = 5 z = -5 - y

Substitute z = -5 - y into the first equation: -(-5 - y) - 2y + 1 = 5 5 + y - 2y + 1 = 5 5 - y + 1 = 5 -y + 6 = 5 -y = -1 y = 1

Now, find z using z = -5 - y: z = -5 - 1 z = -6

Ответ: y = 1, z = -6