Question

Write the direct linear variation equation for the relationship:

y varies directly with x and y = 4 when x = 12.

A.
y = x – 8

B.
y = 3x

C.
y = x + 8

D.
y = 1/3x

Answer 1

it's either A. or D.

Answer 2

The equation being y=kx.
Plug in the values you have and solve for k.

Answer 3

Solve: \(4=12k\) for k, what do you get?

Answer 4

k = 1/3?

Answer 5

Right!
Now plug k into \(y=kx\) and you get..?

Answer 6

D!

Answer 7

Yup, nice job :)

Answer 8

thx