Question

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

Answer 1

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.