Question

{3х - 3у = 12,
{3х + 2у = 17;
Помогите

Answer 1

Ответ:

$(5; 1)$

Пошаговое объяснение:

$\left \{ {{3x - 3y = 12} \atop {3x+2y = 17}} \right. \\\\ \left \{ {{3(x - y) = 12} \atop {3x+2y = 17}} \right. \\\\ \left \{ {{x-y=4} \atop {3x+2y = 17}} \right. \\\\x = 4 + y\\\\3(4 + y) + 2y = 17\\\\12 + 3y + 2y = 17\\\\3y + 2y = 17 - 12\\\\5y = 5\\\\y = 1\\\\x = 4 + y\\\\x = 4 + 1\\\\x = 5$

Answer 2

Пошаговое объяснение:

{3х-3у=12. /*2

{3х+2у=17. /*3

{6х-6у=24

+

{9х+6у=51

=

15х=75

х=5

15-3у=12

-3у=-3

у=1