Question

The variables y and x have a proportional relationship, and y = 5 when x = 4.

Answer 1

Given is -

The variables y and x have a proportional relationship, and y = 5 when x = 4.

$\frac{y}{x}=\frac{5}{4}$

As we have to find the value of x when y= 8 so putting y = 8 in the above relationship, we get :

$\frac{8}{x}=\frac{5}{4}$

$5x=32$

$x=6.4$

Hence, the answer is 6.4