Question

If y is directly proportional to Vx, and y = 25 when x = 3, find x when
y = 100

Answer 1

9514 1404 393

Answer:

x = 48

Explanation:

It looks like your proportion is ...

y = k√x

Then k can be found as ...

k = y/√x = 25/√3

__

For y = 100, the value of x can be found from ...

100 = (25/√3)√x

4√3 = √x . . . . . . . . . . multiply by √3/25

48 = x . . . . . . . . . . . . . square both sides