Система, решить. 2X + 2y = 12 X-y = 1
X-y = 1 x = 1+y 2(1+y) + 2y = 12 2+ 4y = 12 ; 4y = 10 ; y =5/2 x = 1+ 5/2 = 7/2 ; Ответ : y = 5/2 ; x = 7/2