Question

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

Answer 1

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.

Answer 2

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)