Question

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

Answer 1

Answer:

20

Step-by-step 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

$\frac{x_1}{x_2} = \frac{y_1}{y_2}$

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

substituting we get :

$\frac{25}{40} = \frac{12.5}{y_2}$

y₂ = 20

So, y = 20