{1у-2х=6
{у+2х=10
б підстановки

{1у-2х=6

{у+2х=10

{1у-2х=6

{y =10-2x

1(10 - 2x) - 2x = 6

10 - 2x - 2x = 6

10 - 4x = 6

-4x = 10 - 6

-4x = -4

x = 1

y = 10 - 2 × 1

y = 10 - 2

y = 8

{1×8 - 2×1 = 6

{8 + 2×1 = 10

{6 = 6

{10 = 10

Получается... (x; y) = (1; 8)