The values of x and y vary directly

and one pair of values are given.

Write an equation that relates x

and y. Simplify completely.

x = 0.1, y = 0.9

A

y = [? ]x

Direct variation equation is y=kx. Your k is your variation or you could look at it as your slope. y=kx Plug in what you know, 4=k12 Divide both sides by 12 to cancel out your 12 that is being multiplied by k.

4 (/12) = k12 (/12) Simplify

1/3=k

y=1/3x This is your direct variation equation.

Step-by-step explanation:

1) y=kx

plug in the #s

(0.9) = k (0.1)

divide both sides by 0.1

k=9

plug in k and that is your equation (y=9x)