Question

꧁ajuda nos dois pfvvʕ •́؈•̀ ₎ ꧂​

Answer 1

Resposta:

creio que do primeiro seja s= (-2, 6)

Answer 2

1)

x+y=4. -----> x=4-y

x-y=8

x-y=8

4-y-y=8

-2y=8-4

-2y=4

y=4/-2

y= -2

x= 4-y

x= 4-(-2)

x= 6

S={6,-2}

2)

3x+2y=-5

x-2y=-7. -----> x=-7+2y

3(-7+2y)+2y=-5

-21+6y+2y=-5

8y=-5+21

8y= 16

y= 16/8

y= 2

x= -7+2y

x= -7+2×2

x= -7+4

x= -3

S={-3,2}