(4x/3 ) + (3y/4) = 18
(7x/3) - (5y/8) = 16
Решение
4•4х + 3•3y = 18•12
7x•8 - 5y•3 = 16•24
•••••••••
16x + 9y = 216 (•- 3,5)
56x - 15y = 384
•••••
- 56x - 31,5y = - 756
- 46,5y = - 372
y = 8
16x + 9•8 = 216
16x = 216 - 72
X = 144 : 16
X = 9
Ответ ( 9 ; 8 )