Question

2/x = 6/y

x+y=42

qual é o valor de x e y?

Answer 1

 2      6
--- = ----
 x      y

6x = 2y
x = 2y/6
x = y/3

x + y = 42
(y/3) + y = 42
y + 3y = 126
4y = 126
y = 126/4
y = 126:2/4:2
y = 63/2

x = y/3
x = (63/2) / 3

x = 63/(2.3)
x = 63/6
x = 63:3/6:3
x = 21/2