Question

Реши систему:
{ z=7+y
z−2y+2=4

Answer 1

z=7+y

z−2y+2=4

z - у = 7 | × (-2)

z −2y = 2

-2z + 2y = -14

z −2y = 2

-z = -12

z = 12

12 - y = 7

y = 12 - 7

y = 5

Ответ: 5; 12.