Решите систему уравнений: {8x+y=-6; {2x+5y=12

8х + y = - 6
y = - 8x - 6
2x + 5y = 12
2x + 5( - 8x - 6 ) = 12
2x - 40x - 30 = 12
- 38x = 42
x = - 42/38 = - 21/19 = - 1 2/19
y = - 8•( - 21/19 ) - 6 = 168/19 - 6 = 8 ( 16/19 ) - 6 = 2 ( 16/19 )
ответ ( - 1 2/19 ; 2 16/19 )

( y=-6-8x
( -2x +5(-6-8x)=12
(y=-6-8x
(-2x-30-40x=12

(y=-6-8x
(-42x=42

x=-1
y=-6-8(-1)=2