Question

A direct variation function contains the points (-9, -3) and (-12, -4) Which equation represents the function?

Answer 1

Answer:

y = $\frac{1}{3}$ x

Step-by-step explanation:

Given that y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

To find k use either of the 2 given points

Using (- 9, - 3), then

k = $\frac{y}{x}$ = $\frac{-3}{-9}$ = $\frac{1}{3}$

y = $\frac{1}{3}$ x ← equation of function