Question

Calcule x e y: x/y = 5/4 e x+y = 18

Answer 1

x/y = 5/4
x = 5y/4

x + y = 18
5y/4 + y = 18
(5y + 4y)/4 = 18
9y/4 = 18
9y = 4.18
9y = 72
y = 72/9
y = 8

x + y = 18
x + 8 = 18
x = 18 - 8
x = 10

Solução do sistema:

x = 10
y = 8