Question

If w varies directly as 2x - 1, and w = 9 when x = 2, find x when w = 15.

Answer 1

jk im an idiot x = 3 doesn't it.

Answer 2

You are correct.

Answer 3

So then. wait. @kropot72 what is x when w is 15...

Answer 4

w = k(2x - 1) where k is a constant of proportionality.
9 = k(4 - 1) = 3k
k = 3
w = 3(2x - 1)
15 = 3(2x - 1)..............(1)
Just solve equation (1) to find the value of x when w = 15

Answer 5

@kropot72 you're actually perfect and I love you

Answer 6

You're welcome :)