Question

y varies inversely as the cube of x. When x = 2, y = 10. Find the value of x when y = 1.25​

Answer 1

Answer:

x = 4

Step-by-step explanation:

$y = \frac{k}{ {x}^{3} }$

Here K = proportionality constant

Thus for Y = 10 and X = 2

K = (X^3)*Y = (2^3)*10 = 80

Now when Y = 1.25 and K = 80

X^3 = K/Y = 80/1.25 = 64

Thus X^3 = 64

So x = 4