Question

Система двух уравнений

Answer 1

{2 (у + 1) = 2u - 4
5u + y = 3u + 6

{2y + 2 = 2u - 4
y + 5u = 3u + 6

{2y - 2u = -6
-2y -4u = -12

-6u = -18; u = 3
u = 3; y +5×3 = 3×3 +6
y +15 = 15
y = 0
Ответ: u = 3; y = 0.