Question

Y is inversely proportional to cube of x y=5 when x =2 find y when x=4

Answer 1

Answer:

4x

Step-by-step explanation:

Answer 2

Answer:

If

y is inversely proportional to x, and if

y = 6

when

x = 4

then

y = 24

Using this formula we find that if

y = 8

then

x = 3

−−−−−

Step-by-step explanation:

Given,

y is inversely proportional to x

or y ∝ x − 1

this is if and only if

y ∝ 1 x

⇔y = 1 x k

Also, we know that if

y = 6

when x = 4

then

6 = 14k

⇔multiply both sides by 4

24 = k

this is our constant of proportionality

⇒this gives us our formula

y = 24x

Then consider when

y = 8

then

8= 24x

multiply both sides by x

8x = 24

⇔divide both sides by 8

x = 3