Question

When xb= 12, y = 8. Find x when y = 12

Answer 1

Answer:

If it is direct proportionality, then y = kx where k is a constant.  Use the given information to find k:

 

8 = k(12) ⇒ k = 8/12 = 2/3

 

y = (2/3) x

 

For y = 12,

 

12 = (2/3) x ⇒ x = (3/2)*12 = 18

 

x = 18 when y = 12

I hope this helps a little bit.