Question

Find y when x=15 if y=6 when x=30

Answer 1

If y = 6 when x = 30

30/15 = 2

So 6/2 = 3

Answer : when x = 15, y = 3

Answer 2

You haven't told us the relationship between 'x' and 'y'. Maybe y is always 1/5 of x. Then y=3. Maybe y is always 24 less than x. Then y is -9. Maybe y is always 6 no matter what x is. / / / You gave us one point on the line ... not enough to tell what any other point is.