Verified answer

7x + 3y = 43

4x - 3y = 67

(7x + 3y) + (4x - 3y) = 43 + 67

7x + 3y + 4x - 3y = 110

11x = 110

x = 10

40 - 3y = 67

-3y = 27

y = -9

Ответ: (10; -9).