Question

найдите решение системы уравнений
{x - 2y = 5
{3x + 8y = 1

{4y - x = 11
{5x - 2y = 17

Answer 1

X - 2y = 5
- 3x + 6y = - 15
3x + 8y = 1
14y = - 14
y = - 1
X + 2 = 5
X = 3
Ответ ( 3 ; - 1 )
4y - X = 11
X = 4y - 11
5x - 2y = 17
5( 4y - 11 ) - 2y = 17
20y - 55 - 2y = 17
18y = 72
y = 4
X = 16 - 11 = 5
Ответ ( 5 ; 4 )