Решить систему уравнения 12 – 2x + 3y =20 12 + 4x-2y=20

{12 - 2x + 3y = 20
{12 + 4x - 2y = 20
{x = - 4 + 3/2y
{x = 12 + 4x - 2y = 20
12 + 4(- 4 + 3/2y) - 2y = 20
y = 6
12 + 4x - 2 • 6 = 20
x = 5
(x, y) = (5, 6)
{12 - 2 • 5 + 3 • 6 = 20
{12 + 4 • 5 - 2 • 6 = 20
{20 = 20
{20 = 20
(x, y) = (5, 6)
ответ: х = 5., у = 6.