Question

Variable y varies directly with variable x, and y = 5 when x = 8.
What is the value of x when y = 15?

I know that the formula is x = ky so, 8 = k(5) but where do I put the 15??

Answer 1

isn't it y=kx

Answer 2

Let me check. one sec.

Answer 3

Yea, my bad.

Answer 4

Looks like my teacher gave me the wrong formula lol

Answer 5

lolol ;P

Answer 6

then it should be like y=kx
5=8k what's k?

Answer 7

I think your suppose to solve for k. So divide 8 on both sides? But what do I do with the 15?

Answer 8

what did u get for k first?

Answer 9

I divided 8 sides. So k = 5/8, which got me 0.645.

Answer 10

5/8 i got 0.625 0.0 xD

Answer 11

now we have
y=kx
15=0.625x solve for x :)

Answer 12

x = 24

Answer 13

yes :) is that one of ur option?

Answer 14

thx for the medal :)

Answer 15

Yep. Thank you so much!