Respuesta :

If the variables y and x have a proportional relationship, we have

[tex]xy=k[/tex]

Since (x,y)=(4,5) is a valid pair, we know that

[tex]xy=20[/tex]

So, if y = 8, we have

[tex]8x=20 \iff x=\dfrac{20}{8}=\dfrac{5}{2}[/tex]