Question

2x+5y=39
y=4y me ajudem

Answer 1

Resposta:

2x+5y=39

2x+5(4y)=39

2x+20y=39

20y=39-2x

y=39-2x/20

2x+5y=39

2x+5(39-2x/20)=39

2x+195-10x=39

-8x=39-195

-8x=-156(-1)

8x=156

x=156/8

x=19,5

y=39-2x/20

y=39-2.19,5/20

y=39-39/20

y=0/20

y=0

Creio que seja isso

Answer 2

Explicação passo-a-passo:

( 2x+5y=39

( x=4y

reorganizar

( 2x + 5y = 39

(x - 4y = 0.(-2)

(2x+ 5y = 39

( -2x + 8y = 0

============ +

13x = 39

x = 39/13

x =3

substituir

2x + 5y = 39

2(3)+ 5y = 39

6+ 5y =39

5y= 39-6

5y = 33

y =33/5