Question

I never used this site before and I need help with my algebra. Here's the question.
Write a direct variation equation that relates x and y. Assume that y varies directly as x. Then solve.

If y = 18 when x = 6, find x when y = –54.

Answer 1

alright so basically what you have to do is to find to constant, which means that when x varies such as when x increases, how much would y increase by?
y varies directly as x so ----> y=kx where k=constant, simply substitute: 18=6k , so k =3
After that, put it back into the formula along with the new value of y to get x
(basically: -54=3x) and you find x by dividing -54 by 3

Answer 2

Is -18 right

Answer 3

yup :)

Answer 4

So its y=3x;-18

Answer 5

yup :) i hope you understand it

Answer 6

Thank u!!

Answer 7

no probs ;)