Question

If y=8 when x=3 when x=45

Answer 1

The value of y for x = 45 is 120 .

Explanation:

Given as :

Let The variables y and x are proportional to each others

I,e y ∝ x

Now , y = k x

So, for x = 3 , y = 8

I.e 8 = k × 3 ........1

∴ k =
`(8)/(3)`

Similarly

for x = 45 , y = k × 3

I.e y = k × 45 ..........2

Now, putting the value of k in eq 2

So, y =
`(8)/(3)` × 45

I.e y =
`(8* 45)/(3)`

Or, y = 8 × 15

∴ y = 120

So, for x = 45 , y = 120

Hence The value of y for x = 45 is 120 . Answer