Question

7x -8y = 24
- 7x + 18y = 18​

Answer 1

VAMOS LÁ,

Yare yare daze

{7x - 8y = 24

{-7x + 18y = 18

___________+

18y - 8y = 24+ 18

10y = 42

y = 42/10

y = 21/5

y = 4.2

7x - 8y = 24

7x = 24 + 8y

7x = 24 + 8*4.2

7x = 24 + 33,6

7x = 57,6

7x = 576/10

7x = 288/5

x = (288/5) / 7

x = (288/5) * 1/7

x = 288/35

Espero ter ajudado *-