Question

Qual o valor de x e y x+y=20 2x+4y=54 ?

Answer 1

x+y= 20 ->x= 20-y
2x+4y= 54

2(20-y)+4y=54
40-2y+4y=54
2y=54-40
2y=14
y=14/2
y=7



x= 20-y
x= 20-7
x= 13




-> Espero ter ajudado! ;)