Question

5x pe 2y= 1,25 ; y pe x ?

Answer 1

1.25*5=6.25(x)
1.25*2=2.5(y)

Answer 2

$\frac{5x}{2y} = \frac{125}{100} \\ \\ 500x = 250y => \frac{y}{x} = \frac{500}{250} => \frac{y}{x} = 2$