Question

Даю 25 баллов 1 вопрос пожалуйста.​

Answer 1

(6; 9) = (x; y)

{ax-3y = 12

{5x+by = 21

1)ax-3y = 12

6a-27 = 12

6a = 39

a = 39/6 = 13/2 = 6.5

2)5x+by = 21

30+9b = 21

9b = -9

b = -1