Решите ,2 и 3 Срочно пожалуйста умоляю срочно

Задание 2.
$\left \{ {{15x - 4y = 4} \atop {3x - y = - 2}} \right.$
$\left \{ {{15x - 4y = 4} \atop {y = 3x + 2}} \right.$
15x - 4 (3x + 2) = 4
15x - 12x - 8 = 4
3x = 4 + 8
3x = 12
x = 4
$\left \{ {{x = 4} \atop {y = 3 * 4 + 2} \right.$
$\left \{ {{x = 4} \atop {y = 14 }} \right.$
Ответ: (4; 14)

Задание 3.
$\left \{ {{5x - 3y = 13} \atop {2x + 7y = 38}} \right.$
$\left \{ {{35x - 21y = 91} \atop {6x + 21y = 114}} \right.$
41x = 205
x = 5
$\left \{ {{x = 5} \atop {5 * 5 - 3y = 13}} \right.$
$\left \{ {{x = 5} \atop {3y = 25 - 13}} \right.$
$\left \{ {{x = 5} \atop {3y = 12}} \right.$
$\left \{ {{x = 5} \atop {y = 4}} \right.$
Ответ: (5; 4)