Question

b)2x+4y:36
x+y:18
Ajudem?

Answer 1

2x +4y = 36
x +y = 18(-2)

2x +4y = 36
-2x -2y = -36

2y = 0
y = 2

Substituindo Y Em I ou II e Descobrindo X
I :
x +2 = 18
x = 18 -2
x = 16

II :
2 . 2 +4y = 36
4 +4y = 36
4y = 36 -4
4y = 32
y = 32/4
y = 8

Answer 2

B)2x+4y = 36(;2)
     x+y = 18

x+2y = 18
x+y  =18(-1)

 x+2y = 18
-x-y  = -18
    y = 0

x = 18 - y ==> x = 18 - 0 ==> x = 18