Question

Variables of x and y are in direct proportion, and y=12.5 when x=25. if x=40 the y=

Answer 1

20

Explanation:

20 is correct. Since y = kx and 12.5 = 25k, k = 1 /2

Plug in 40 for x to get 20 for y.

Answer 2

if x and y are Directly proportional then :

x ∝ y

`(x_1)/(x_2) = (y_1)/(y_2)`

here x₁ = 25 and x₂ = 40 and y₁ = 12.5

substituting we get :

`(25)/(40) = (12.5)/(y_2)`

y₂ = 20

So, y = 20