Question

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

Answer 1

Answer:

The value of y for x = 45 is 120 .

Step-by-step 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 = $\frac{8}{3}$

Similarly

for x = 45 , y = k × 3

I.e y = k × 45        ..........2

Now, putting the value of k  in eq 2

So,  y =  $\frac{8}{3}$ × 45

I.e y = $\frac{8\times 45}{3}$

Or, y = 8 × 15

∴    y = 120

So, for x = 45 , y = 120

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