Answer
Equation: y=$-\frac{56}{3}$x
y=-224 when x=12
Work Step by Step
First we know that the form of a direct variation is y=kx so lets plug in the coordinate given to us in order to find the k.
9$\frac{1}{3}$=k(-$\frac{1}{2}$) (Divide by $-\frac{1}{2}$ to both sides)
$-\frac{56}{3}$=k
So now we can write the general equation:
y=$-\frac{56}{3}$x
In order to find the y when x is 12, lets plug 12 in for x in our general equation that we found.
y=$-\frac{56}{3}$(12) (Simplify)
y=-224
